Ethan Siegel
@startswithabang.bsky.social
Cosmologist, science communicator, author, speaker, and longtime writer of Starts With A Bang.
Not the next Carl Sagan; the first Ethan Siegel.
Not the next Carl Sagan; the first Ethan Siegel.
Hey fun fact!
Did you know that the @nytimes.com has their guidebook for "Ethical Journalism" published right on their website?
I couldn't make it through the first two paragraphs without laughing.
The consequences for not following it seem to be... promotions?
www.nytimes.com/editorial-st...
Did you know that the @nytimes.com has their guidebook for "Ethical Journalism" published right on their website?
I couldn't make it through the first two paragraphs without laughing.
The consequences for not following it seem to be... promotions?
www.nytimes.com/editorial-st...
A Handbook of Values and Practices for the News and Opinion Departments
www.nytimes.com
February 12, 2026 at 9:50 PM
Hey fun fact!
Did you know that the @nytimes.com has their guidebook for "Ethical Journalism" published right on their website?
I couldn't make it through the first two paragraphs without laughing.
The consequences for not following it seem to be... promotions?
www.nytimes.com/editorial-st...
Did you know that the @nytimes.com has their guidebook for "Ethical Journalism" published right on their website?
I couldn't make it through the first two paragraphs without laughing.
The consequences for not following it seem to be... promotions?
www.nytimes.com/editorial-st...
Einstein the “lone genius” is a complete myth
Was Einstein a lone genius who succeeded because he bucked the establishment?
Without the help he got from his contemporaries, he never would have discovered all he did.
bigthink.com/starts-with-...
#physics #einstein #genius #collaboration
Was Einstein a lone genius who succeeded because he bucked the establishment?
Without the help he got from his contemporaries, he never would have discovered all he did.
bigthink.com/starts-with-...
#physics #einstein #genius #collaboration
Einstein the "lone genius" is a complete myth
Even the most brilliant mind in history couldn't have achieved all he did without significant help from the minds of others.
bigthink.com
February 12, 2026 at 4:51 PM
Einstein the “lone genius” is a complete myth
Was Einstein a lone genius who succeeded because he bucked the establishment?
Without the help he got from his contemporaries, he never would have discovered all he did.
bigthink.com/starts-with-...
#physics #einstein #genius #collaboration
Was Einstein a lone genius who succeeded because he bucked the establishment?
Without the help he got from his contemporaries, he never would have discovered all he did.
bigthink.com/starts-with-...
#physics #einstein #genius #collaboration
This is how fascists operate.
This is what a controlled "free press" looks like.
Yes, they're lying.
Yes, they know they're lying.
Yes, they know we know they're lying.
But they're doubling down to curry favor with the ideology of those in power.
This is no shift. This is the core of the NYT.
This is what a controlled "free press" looks like.
Yes, they're lying.
Yes, they know they're lying.
Yes, they know we know they're lying.
But they're doubling down to curry favor with the ideology of those in power.
This is no shift. This is the core of the NYT.
The Times's coverage of Feb. 3 and 4 accurately reported the public statements of both the American Society of Plastic Surgeons and the American Medical Association. Our reporting also accurately contextualized the shift from both of these organizations regarding gender-related surgical procedures.
February 11, 2026 at 9:22 PM
This is how fascists operate.
This is what a controlled "free press" looks like.
Yes, they're lying.
Yes, they know they're lying.
Yes, they know we know they're lying.
But they're doubling down to curry favor with the ideology of those in power.
This is no shift. This is the core of the NYT.
This is what a controlled "free press" looks like.
Yes, they're lying.
Yes, they know they're lying.
Yes, they know we know they're lying.
But they're doubling down to curry favor with the ideology of those in power.
This is no shift. This is the core of the NYT.
Last gasps of dying Sun-like star captured by Hubble
Before making a planetary nebula, Sun-like stars go through a brief "preplanetary nebula" phase.
We just imaged the closest, youngest one with Hubble.
The result is as educational as it is beautiful.
bigthink.com/starts-with-...
#space #astro
Before making a planetary nebula, Sun-like stars go through a brief "preplanetary nebula" phase.
We just imaged the closest, youngest one with Hubble.
The result is as educational as it is beautiful.
bigthink.com/starts-with-...
#space #astro
Last gasps of dying Sun-like star captured by Hubble
Before Sun-like stars die, they transition from AGB red giants into pre-planetary nebulae. Here's how Hubble sees the famous Egg Nebula.
bigthink.com
February 11, 2026 at 4:07 PM
Last gasps of dying Sun-like star captured by Hubble
Before making a planetary nebula, Sun-like stars go through a brief "preplanetary nebula" phase.
We just imaged the closest, youngest one with Hubble.
The result is as educational as it is beautiful.
bigthink.com/starts-with-...
#space #astro
Before making a planetary nebula, Sun-like stars go through a brief "preplanetary nebula" phase.
We just imaged the closest, youngest one with Hubble.
The result is as educational as it is beautiful.
bigthink.com/starts-with-...
#space #astro
Carl Sagan’s 9 timeless lessons for detecting baloney
It's been 30 full years since Carl Sagan's Demon Haunted World came out, complete with the now-classic "baloney detection kit."
These 9 lessons from it are more important than ever here in 2026.
bigthink.com/starts-with-...
#space #skepticism
It's been 30 full years since Carl Sagan's Demon Haunted World came out, complete with the now-classic "baloney detection kit."
These 9 lessons from it are more important than ever here in 2026.
bigthink.com/starts-with-...
#space #skepticism
Carl Sagan's 9 timeless lessons for detecting baloney
Carl Sagan's baloney detection kit taught us how to separate good science from the work of charlatans. In 2026, that matters more than ever.
bigthink.com
February 10, 2026 at 4:45 PM
Carl Sagan’s 9 timeless lessons for detecting baloney
It's been 30 full years since Carl Sagan's Demon Haunted World came out, complete with the now-classic "baloney detection kit."
These 9 lessons from it are more important than ever here in 2026.
bigthink.com/starts-with-...
#space #skepticism
It's been 30 full years since Carl Sagan's Demon Haunted World came out, complete with the now-classic "baloney detection kit."
These 9 lessons from it are more important than ever here in 2026.
bigthink.com/starts-with-...
#space #skepticism
All claims of extraterrestrial life must pass these 7 hurdles
The old recipe of "observe something unusual, declare presence of aliens" doesn't work anymore: at least on scientists.
The seven hurdles of the CoLD scale illustrate why.
bigthink.com/starts-with-...
#space #aliens #astro #astrobiology
The old recipe of "observe something unusual, declare presence of aliens" doesn't work anymore: at least on scientists.
The seven hurdles of the CoLD scale illustrate why.
bigthink.com/starts-with-...
#space #aliens #astro #astrobiology
All claims of extraterrestrial life must pass these 7 hurdles
No claim has even made it halfway up the Confidence of Life Detection (CoLD) scale, but 21st century science is just beginning to unfold.
bigthink.com
February 9, 2026 at 4:17 PM
All claims of extraterrestrial life must pass these 7 hurdles
The old recipe of "observe something unusual, declare presence of aliens" doesn't work anymore: at least on scientists.
The seven hurdles of the CoLD scale illustrate why.
bigthink.com/starts-with-...
#space #aliens #astro #astrobiology
The old recipe of "observe something unusual, declare presence of aliens" doesn't work anymore: at least on scientists.
The seven hurdles of the CoLD scale illustrate why.
bigthink.com/starts-with-...
#space #aliens #astro #astrobiology
Starts With A Bang Podcast #126 – The origin of dust
Dust is much more than just light-blocking "noise" for astronomers.
It's required to form rocky planets and enable life.
And now, in 2026, we're finally uncovering its ultimate origins!
bigthink.com/starts-with-...
#space #astro #dust #physics
Dust is much more than just light-blocking "noise" for astronomers.
It's required to form rocky planets and enable life.
And now, in 2026, we're finally uncovering its ultimate origins!
bigthink.com/starts-with-...
#space #astro #dust #physics
Starts With A Bang Podcast #126 - The origin of dust
Here in our modern Universe, it's cosmic dust that forms planets, complex molecules, and enables life. But how did the Universe create it?
bigthink.com
February 7, 2026 at 6:16 PM
Starts With A Bang Podcast #126 – The origin of dust
Dust is much more than just light-blocking "noise" for astronomers.
It's required to form rocky planets and enable life.
And now, in 2026, we're finally uncovering its ultimate origins!
bigthink.com/starts-with-...
#space #astro #dust #physics
Dust is much more than just light-blocking "noise" for astronomers.
It's required to form rocky planets and enable life.
And now, in 2026, we're finally uncovering its ultimate origins!
bigthink.com/starts-with-...
#space #astro #dust #physics
How long can the longest-lived star shine?
#AskEthan
It's been 13.8 billion years since the Big Bang, but the longest-lived stars will shine for many trillions of years.
How long do we have before the last survivor goes out?
bigthink.com/starts-with-...
#space #astro #stars #future
#AskEthan
It's been 13.8 billion years since the Big Bang, but the longest-lived stars will shine for many trillions of years.
How long do we have before the last survivor goes out?
bigthink.com/starts-with-...
#space #astro #stars #future
Ask Ethan: How long can the longest-lived star shine?
13.8 billion years have passed since the Big Bang, but many stars will survive for longer than that. What's the longest-lived a star can be?
bigthink.com
February 6, 2026 at 4:32 PM
8 ways that Venus is the Solar System’s most extreme planet
Venus is the Solar System's hottest planet, as well as the brightest planet in Earth's night skies.
But there are so many additional ways that Venus is truly a world of extremes.
bigthink.com/starts-with-...
#space #venus #astro
Venus is the Solar System's hottest planet, as well as the brightest planet in Earth's night skies.
But there are so many additional ways that Venus is truly a world of extremes.
bigthink.com/starts-with-...
#space #venus #astro
8 ways that Venus is the Solar System's most extreme planet
Even at its faintest, Venus always outshines every other star and planet that's visible from Earth, and then some!
bigthink.com
February 5, 2026 at 4:37 PM
8 ways that Venus is the Solar System’s most extreme planet
Venus is the Solar System's hottest planet, as well as the brightest planet in Earth's night skies.
But there are so many additional ways that Venus is truly a world of extremes.
bigthink.com/starts-with-...
#space #venus #astro
Venus is the Solar System's hottest planet, as well as the brightest planet in Earth's night skies.
But there are so many additional ways that Venus is truly a world of extremes.
bigthink.com/starts-with-...
#space #venus #astro
Yes, JWST should take the deepest deep-field image ever
The Hubble deep fields revealed the Universe.
JWST's novel imagery has surpassed all of Hubble's limits.
So when are we going to get a truly deep JWST deep field?
bigthink.com/starts-with-...
#space #jwst #astro #nasa #hubble
The Hubble deep fields revealed the Universe.
JWST's novel imagery has surpassed all of Hubble's limits.
So when are we going to get a truly deep JWST deep field?
bigthink.com/starts-with-...
#space #jwst #astro #nasa #hubble
Yes, JWST should take the deepest deep-field image ever
Many collaborations have used JWST to take deep-field images: some wider and some deeper than others. Here's how it can surpass them all.
bigthink.com
February 4, 2026 at 4:43 PM
The most important quantum advance of the 21st century
The discovery of quantum mechanics forced us to reckon with the concept of an indeterministic Universe.
2012's PBR theorem closed the door on all kinds of deterministic options.
bigthink.com/starts-with-...
#physics #quantum #PBRtheorem
The discovery of quantum mechanics forced us to reckon with the concept of an indeterministic Universe.
2012's PBR theorem closed the door on all kinds of deterministic options.
bigthink.com/starts-with-...
#physics #quantum #PBRtheorem
The most important quantum advance of the 21st century
A century ago, quantum physics overthrew our view of a deterministic Universe. A profound 21st century theorem closes the door even further.
bigthink.com
February 3, 2026 at 4:52 PM
The most important quantum advance of the 21st century
The discovery of quantum mechanics forced us to reckon with the concept of an indeterministic Universe.
2012's PBR theorem closed the door on all kinds of deterministic options.
bigthink.com/starts-with-...
#physics #quantum #PBRtheorem
The discovery of quantum mechanics forced us to reckon with the concept of an indeterministic Universe.
2012's PBR theorem closed the door on all kinds of deterministic options.
bigthink.com/starts-with-...
#physics #quantum #PBRtheorem
Unless there were crimes committed at those parties, Todd.
And what were the crimes committed there, Todd?
WHAT WERE THE CRIMES TODD??
And what were the crimes committed there, Todd?
WHAT WERE THE CRIMES TODD??
February 3, 2026 at 12:48 AM
Unless there were crimes committed at those parties, Todd.
And what were the crimes committed there, Todd?
WHAT WERE THE CRIMES TODD??
And what were the crimes committed there, Todd?
WHAT WERE THE CRIMES TODD??
The NSF graduate research fellowship program (GRFP) is one of those early career "elevators" that can help exceptional young researchers become extraordinarily successful senior scientists.
Many of them are being returned without review in unprecedented fashion.
Don't be a casualty! Do this!
Many of them are being returned without review in unprecedented fashion.
Don't be a casualty! Do this!
NSF GRFP applicants (and mentors): Was your application Returned Without Review and deemed ineligible despite fitting in the allowed topics?
1) Write NSF
2) Write your Congressperson
3) CC us at grfp@grant-witness.us so we can compile + follow up
Details and template at grant-witness.us/grfp-letter
1) Write NSF
2) Write your Congressperson
3) CC us at grfp@grant-witness.us so we can compile + follow up
Details and template at grant-witness.us/grfp-letter
February 2, 2026 at 6:54 PM
The NSF graduate research fellowship program (GRFP) is one of those early career "elevators" that can help exceptional young researchers become extraordinarily successful senior scientists.
Many of them are being returned without review in unprecedented fashion.
Don't be a casualty! Do this!
Many of them are being returned without review in unprecedented fashion.
Don't be a casualty! Do this!
JWST shakes up the hunt for earliest galaxy cluster
A newly discovered galaxy protocluster by JWST doesn't break the cosmic record; it's only the 4th most distant one.
But it's the first with hot, X-ray emitting gas, and that means something.
bigthink.com/starts-with-...
#space #astro #Xray
A newly discovered galaxy protocluster by JWST doesn't break the cosmic record; it's only the 4th most distant one.
But it's the first with hot, X-ray emitting gas, and that means something.
bigthink.com/starts-with-...
#space #astro #Xray
JWST shakes up the hunt for earliest galaxy cluster
The Universe formed stars, galaxies, and even galaxy clusters extremely early on in our cosmos. This new marvel is one more JWST surprise.
bigthink.com
February 2, 2026 at 5:38 PM
JWST shakes up the hunt for earliest galaxy cluster
A newly discovered galaxy protocluster by JWST doesn't break the cosmic record; it's only the 4th most distant one.
But it's the first with hot, X-ray emitting gas, and that means something.
bigthink.com/starts-with-...
#space #astro #Xray
A newly discovered galaxy protocluster by JWST doesn't break the cosmic record; it's only the 4th most distant one.
But it's the first with hot, X-ray emitting gas, and that means something.
bigthink.com/starts-with-...
#space #astro #Xray
Hey you undergrads and grad students who want to do a NASA internship on icy moons and geophysics!
Go apply and take advantage of this stellar (or at least planetary) opportunity!
Go apply and take advantage of this stellar (or at least planetary) opportunity!
Do you know of an undergrad who would be a good fit for icy moons or geophysics research? If so, encourage them to apply here: stemgateway.nasa.gov/s/course-off...
LinkedIn
This link will take you to a page that’s not on LinkedIn
lnkd.in
February 2, 2026 at 7:13 AM
Hey you undergrads and grad students who want to do a NASA internship on icy moons and geophysics!
Go apply and take advantage of this stellar (or at least planetary) opportunity!
Go apply and take advantage of this stellar (or at least planetary) opportunity!
How much damage could a cosmic ray do to a human?
#AskEthan
Cosmic rays come in all varieties of energy and speed, with the most energetic ones outstripping even LHC protons by a factor of millions.
What would happen if one hit you?
bigthink.com/starts-with-...
#space #astro #physics #particle
#AskEthan
Cosmic rays come in all varieties of energy and speed, with the most energetic ones outstripping even LHC protons by a factor of millions.
What would happen if one hit you?
bigthink.com/starts-with-...
#space #astro #physics #particle
Ask Ethan: How much damage could a cosmic ray do to a human?
At the upper limits of what's energetically possible, cosmic rays still persist. What happens if a human gets hit by the most energetic one?
bigthink.com
January 30, 2026 at 6:11 PM
Dark matter’s “nightmare scenario” looks more likely than ever
Perhaps dark matter cannot be directly detected; perhaps it only interacts gravitationally.
That's not an argument against its existence.
That's the nightmare scenario come to life!
bigthink.com/starts-with-...
#physics #space #astro
Perhaps dark matter cannot be directly detected; perhaps it only interacts gravitationally.
That's not an argument against its existence.
That's the nightmare scenario come to life!
bigthink.com/starts-with-...
#physics #space #astro
Dark matter's "nightmare scenario" looks more likely than ever
Our great hope is that today's indirect, astrophysical evidence will someday lead to successful direct detection. What if that's impossible?
bigthink.com
January 29, 2026 at 4:56 PM
Dark matter’s “nightmare scenario” looks more likely than ever
Perhaps dark matter cannot be directly detected; perhaps it only interacts gravitationally.
That's not an argument against its existence.
That's the nightmare scenario come to life!
bigthink.com/starts-with-...
#physics #space #astro
Perhaps dark matter cannot be directly detected; perhaps it only interacts gravitationally.
That's not an argument against its existence.
That's the nightmare scenario come to life!
bigthink.com/starts-with-...
#physics #space #astro
Very different from Streets of Philadelphia, but worth a listen as a 2026-appropriate protest/revolution song.
cc: @spacewhalerider.com
cc: @spacewhalerider.com
I wrote this song on Saturday, recorded it yesterday and released it to you today in response to the state terror being visited on the city of Minneapolis. It’s dedicated to the people of Minneapolis, our innocent immigrant neighbors and in memory of Alex Pretti and Renee Good.
Stay free
Stay free
Bruce Springsteen - Streets Of Minneapolis (Official Audio)
YouTube video by Bruce Springsteen
youtu.be
January 28, 2026 at 5:59 PM
Very different from Streets of Philadelphia, but worth a listen as a 2026-appropriate protest/revolution song.
cc: @spacewhalerider.com
cc: @spacewhalerider.com
JWST finds nine category-defying objects. Have astronomers found their “platypus?”
The platypus, in the animal kingdom, has a collection of features that have never been seen together in any other specimen.
Here's astronomy's version.
bigthink.com/starts-with-...
#space #astro #platypus
The platypus, in the animal kingdom, has a collection of features that have never been seen together in any other specimen.
Here's astronomy's version.
bigthink.com/starts-with-...
#space #astro #platypus
JWST finds nine category-defying objects. Have astronomers found their "platypus?"
Just like animals, galaxies often have bizarre, unusual, or even unique properties. But finding many, all at once, really does raise alarms.
bigthink.com
January 28, 2026 at 4:16 PM
JWST finds nine category-defying objects. Have astronomers found their “platypus?”
The platypus, in the animal kingdom, has a collection of features that have never been seen together in any other specimen.
Here's astronomy's version.
bigthink.com/starts-with-...
#space #astro #platypus
The platypus, in the animal kingdom, has a collection of features that have never been seen together in any other specimen.
Here's astronomy's version.
bigthink.com/starts-with-...
#space #astro #platypus
When you are over your word count, my rule is don't worry about "how many words am I over by" but rather the percentage.
Over by 300 words on a 600 word piece? That's bad!
Over by 300 words on a 3000 word piece? That's nothing!
If your first submitted draft is over by 20% or less, you're on track!
Over by 300 words on a 600 word piece? That's bad!
Over by 300 words on a 3000 word piece? That's nothing!
If your first submitted draft is over by 20% or less, you're on track!
the lion doesn't concern himself with the reality of being grotesquely over wordcount
January 27, 2026 at 5:31 PM
When you are over your word count, my rule is don't worry about "how many words am I over by" but rather the percentage.
Over by 300 words on a 600 word piece? That's bad!
Over by 300 words on a 3000 word piece? That's nothing!
If your first submitted draft is over by 20% or less, you're on track!
Over by 300 words on a 600 word piece? That's bad!
Over by 300 words on a 3000 word piece? That's nothing!
If your first submitted draft is over by 20% or less, you're on track!
Yes, one image from space can change humanity’s perspective
Although we might not think about it often, simply looking at a single image from space can shift the perspective of even the most hard-hearted of humans.
Which one speaks to you the most?
bigthink.com/starts-with-...
#space #astro
Although we might not think about it often, simply looking at a single image from space can shift the perspective of even the most hard-hearted of humans.
Which one speaks to you the most?
bigthink.com/starts-with-...
#space #astro
Yes, one image from space can change humanity's perspective
Our view of the world, the Universe, and ourselves can change with just one glimpse of what's out there. It's happened many times before.
bigthink.com
January 27, 2026 at 4:53 PM
Yes, one image from space can change humanity’s perspective
Although we might not think about it often, simply looking at a single image from space can shift the perspective of even the most hard-hearted of humans.
Which one speaks to you the most?
bigthink.com/starts-with-...
#space #astro
Although we might not think about it often, simply looking at a single image from space can shift the perspective of even the most hard-hearted of humans.
Which one speaks to you the most?
bigthink.com/starts-with-...
#space #astro
In this non-satirical opinion piece by one of the UK's most prominent transphobes, a bigoted monster paints tolerance and acceptance as "illiberal values."
Too bad the @nytimes.com won't reprint Voltaire's 1763 "treatise on tolerance" and let its readers learn something beside hatred for once.
Too bad the @nytimes.com won't reprint Voltaire's 1763 "treatise on tolerance" and let its readers learn something beside hatred for once.
In @nytopinion.nytimes.com
Younger generations “have fallen out of love with Harry Potter because they have fallen out of love with the worldview the series represents,” writes Louise Perry. “Which is to say that young people have fallen out of love with liberalism.”
Younger generations “have fallen out of love with Harry Potter because they have fallen out of love with the worldview the series represents,” writes Louise Perry. “Which is to say that young people have fallen out of love with liberalism.”
Opinion | Why Gen Z Doesn’t Love ‘Harry Potter’
The wizarding worldview is naïve.
nyti.ms
January 27, 2026 at 12:05 AM
In this non-satirical opinion piece by one of the UK's most prominent transphobes, a bigoted monster paints tolerance and acceptance as "illiberal values."
Too bad the @nytimes.com won't reprint Voltaire's 1763 "treatise on tolerance" and let its readers learn something beside hatred for once.
Too bad the @nytimes.com won't reprint Voltaire's 1763 "treatise on tolerance" and let its readers learn something beside hatred for once.
When someone from Minnesota (or Portland, Los Angeles, Chicago, etc.) refers to protestors as "insurgents" or of the movement as an "insurgency," let the alarm bells ring in your head.
You can only have an insurgency against an occupying military force.
They tell on themselves every time.
You can only have an insurgency against an occupying military force.
They tell on themselves every time.
January 26, 2026 at 9:55 PM
When someone from Minnesota (or Portland, Los Angeles, Chicago, etc.) refers to protestors as "insurgents" or of the movement as an "insurgency," let the alarm bells ring in your head.
You can only have an insurgency against an occupying military force.
They tell on themselves every time.
You can only have an insurgency against an occupying military force.
They tell on themselves every time.
What the Universe looks like: from nearby to far away
From our own Solar System to the most distant galaxy and beyond, we've caught glimpses of the Universe on every scale.
Here's what it all looks like.
bigthink.com/starts-with-...
#space #astro #galaxies #stars #planets
From our own Solar System to the most distant galaxy and beyond, we've caught glimpses of the Universe on every scale.
Here's what it all looks like.
bigthink.com/starts-with-...
#space #astro #galaxies #stars #planets
What the Universe looks like: from nearby to far away
Outer space begins just over 100 kilometers up, but what we can see extends for billions of light-years. Here's what all of it looks like.
bigthink.com
January 26, 2026 at 4:58 PM
Where are all the blueshifted galaxies?
#AskEthan
The Universe is expanding, sure.
Nearby, many galaxies are blueshifted, far away, few are, and beyond a certain distances, none are.
What does this imply, and how do we know?
bigthink.com/starts-with-...
#space #astrophysics #astro #expanding
#AskEthan
The Universe is expanding, sure.
Nearby, many galaxies are blueshifted, far away, few are, and beyond a certain distances, none are.
What does this imply, and how do we know?
bigthink.com/starts-with-...
#space #astrophysics #astro #expanding
Ask Ethan: Where are all the blueshifted galaxies?
Even in an expanding Universe, we expect both redshifted and blueshifted galaxies. But nearly every one we see is redshifted. Here's why.
bigthink.com
January 23, 2026 at 5:42 PM
Where are all the blueshifted galaxies?
#AskEthan
The Universe is expanding, sure.
Nearby, many galaxies are blueshifted, far away, few are, and beyond a certain distances, none are.
What does this imply, and how do we know?
bigthink.com/starts-with-...
#space #astrophysics #astro #expanding
#AskEthan
The Universe is expanding, sure.
Nearby, many galaxies are blueshifted, far away, few are, and beyond a certain distances, none are.
What does this imply, and how do we know?
bigthink.com/starts-with-...
#space #astrophysics #astro #expanding