...rs #cepheidvariables #cosmicdistanceladder #standard candles #astronomicaldistances #distancemeasurement #stellarvariability

The cosmic distance ladder uses a series of methods to measure distances to celestial objects, starting with nearby objects and working outward to increasingly distant ones. #CosmicDistanceLadder #Cosmology #Astronomy

Part 2 is now live on YouTube 🎉:

“How To Measure The Universe: The Cosmic Distance Ladder Part 2”, 3Blue1Brown (youtu.be/hFMaT9oRbs4).

#Astronomy #Math #CosmicDistanceLadder #Video #Physics #Cosmos #Universe

A new #CosmicDistanceLadder post on why lunar and solar eclipses tend to come in pairs (for instance, the solar eclipse next week is paired with the lunar eclipse from last week). www.instagram.com/p/DHkS3EcA40L

A #CosmicDistanceLadder on how Christmas in Australia is inverted in many ways from Christmas in the Northern hemisphere, and how the parallax differences were once important in climbing that distance ladder. www.instagram.com/p/DEExnvvRkCQ

A new post on my #CosmicDistanceLadder Instagram with Tanya Klowden on the parallels (but also differences) between ancient Greek and ancient Indian astronomy. www.instagram.com/p/DGzJs02AbBA

A brief update on my #CosmicDistanceLadder instagram with Tanya on the fires that have affected (one of our) home cities. (But the sky is much, much bluer today.) www.instagram.com/p/DEyx7o_OFLz

The cosmic distance ladder is a series of methods used by astronomers to measure distances to increasingly faraway objects. It relies on a chain of techniques, each building upon the previous one, to determine distances across vast cosmic scales. #Cosmology #CosmicDistanceLadder #DistanceMeasure...

A new
#CosmicDistanceLadder
post on the winter/summer solstice in the Northern/Southern hemisphere yesterday: www.instagram.com/p/DD1c47nIKJ2 (One can also refer to this solstice as the Southern solstice - the time of year when the Sun is at its southernmost, regardless where one is on the Earth.)

...of Cepheid variable stars as "standard candles" revolutionized our understanding of the scale of the universe, enabling astronomers to accurately map the distances to increasingly remote objects. #astronomy #history #stellarparallax #cepheidvariables #astronomicaldistance #cosmicdistanceladder

...reasing accuracy. #astronomy #history #variable stars #cepheidvariables #cosmicdistanceladder #standard candles #astronomicaldistances #distancemeasurement #stellarvariability #stellar evolution

A new #CosmicDistanceLadder post, on intriguing hints from the DESI survey data that suggests that the cosmological constant (aka "dark energy) might not, in fact, be constant after all. www.instagram.com/p/DIP0yy5oDUu

A new #CosmicDistanceLadder post on how the distance ladder can also be used to measure cosmic durations, as well as cosmic distances. www.instagram.com/p/DJ2ra2soG4j

A new #CosmicDistanceLadder post, on how the recent lunar eclipse from the vantage point of the Earth becomes a solar eclipse from the vantage point of the Moon: www.instagram.com/p/DHR1tuWonDR/

...n history of the universe. #Cosmology #CosmicDistanceLadder #DistanceMeasurement

The cosmic distance ladder is a collection of methods used by astronomers to measure distances to objects in space, ranging from nearby objects to those billions of light-years away. #CosmicDistanceLadder #Astronomy #Cosmology

A new #CosmicDistanceLadder post to mark the summer solstice, on how astronomical measurements, from the time of Eratosthenes to the modern day, rely on the tireless (and often unsung) efforts of many careful and precise data collectors. www.instagram.com/p/DLG6a_WIWyb