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sublunar.bsky.social
saurabh w jha
@sublunar.bsky.social
260 followers 260 following 17 posts
astronomer, looking up
Posts Replies Media Videos
Reposted by saurabh w jha
astrodame.bsky.social
Nancy Grace Roman telescope is out of the thermal vacuum chamber and getting ready to launch in 2026
November 14, 2025 at 10:33 PM
Reposted by saurabh w jha
asherwolf.bsky.social
Detour Road, North Wangaratta.

#AuroraAustralis #Aurora
Aurora, tree and paddock Aurora, trees and powerlines Paddock, Aurora and stars Headlights. Stars, powerlines, aurora
November 12, 2025 at 11:29 AM
sublunar.bsky.social
Celebrating the 20th anniversary of the Southern African Large Telescope 🔭
Image of the Southern African Large Telescope on the Karoo plateau
November 10, 2025 at 12:44 PM
Reposted by saurabh w jha
benjaminpope.bsky.social
Thrilled to have two years' of work out, in a pair of papers led by @gradientrider.bsky.social and @maxecharles.bsky.social.

We've built a data-driven calibration of the James Webb Interferometer to near its fundamental limits for high-res imaging - explainer at @aunz.theconversation.com!
How we sharpened the James Webb telescope’s vision from a million kilometres away
The only Australian hardware on board the legendary telescope is starting to fulfil its duties.
theconversation.com
October 14, 2025 at 3:35 AM
Reposted by saurabh w jha
sarahkendrew.bsky.social
The petition link is in the article - if you’re in the local DMV community you can sign for support!
karlgalle.bsky.social Karl Galle @karlgalle.bsky.social · Sep 15
The linked article notes that the union for Goddard Space Flight Center employees has asked for signatures on a petition requesting that this decision be reconsidered and the visitor center kept open: hyattsvillewire.com/2025/09/12/g...
Goddard Visitor Center in Greenbelt to Close in October Hyattsville Wire
NASA has announced it intends to close the Goddard Visitor Center, long a favorite spot for families on the Route 1 corridor.
hyattsvillewire.com
September 15, 2025 at 7:25 AM
Reposted by saurabh w jha
physicsmatt.bsky.social
Right now, academic freedom is under attack in the United States. Actually, "under attack" undersells it. "Existentially threatened" is better, along with "already lost in many places."
September 10, 2025 at 1:29 PM
sublunar.bsky.social
Come for the fascinating historical poetry about exploding stars, stay for the excellent technical footnote about what different communities are referring to when they talk about “type Iax” supernovae.
September 6, 2025 at 1:01 AM
Reposted by saurabh w jha
saavikford.bsky.social
A nice write-up of the new @cunygc-astro.bsky.social CUNY-Rutgers-Columbia partnership around Rubin LSST!!

🔭
September 5, 2025 at 9:50 PM
Reposted by saurabh w jha
ozgrav.bsky.social
Congratulations to OzGrav's Deputy Director, Professor Tamara Davis AM, recipient of the 2025 Moyal Medal awarded by Macquarie University for her outstanding contributions to astrophysics and cosmology.

Read more here: lighthouse.mq.edu.au/media-releas...
Milestone Moyal Medal awarded to astrophysicist Tamara Davis
Professor Davis, an astrophysicist at UQ’s School of Mathematics, will receive the medal and deliver the 2025 Moyal Lecture on Thursday 9 October. Her lecture, titled ‘New light on dark energy: the…
lighthouse.mq.edu.au
September 1, 2025 at 12:40 AM
Reposted by saurabh w jha
astroarxiv.bsky.social
Tip of the Red Giant Branch Distances to NGC 1316, NGC 1380, NGC 1404, & NGC 4457: A Pilot Study of a Parallel Distance Ladder Using Type Ia Supernovae in Early-Type Host Galaxies. Max J. B. Newman et. al. https://arxiv.org/abs/2508.20023
Figure 1 Figure 2 Figure 3 Figure 4
August 28, 2025 at 4:22 AM
Reposted by saurabh w jha
geckzilla.bsky.social
An image I made quite a while ago finally got published in a multi-image press release at the Chandra website today. HST, Chandra, VLA, and JWST data all in one.
flic.kr/p/2qb3dUX
chandra.si.edu/photo/2025/c...
An extravagantly colored spiral galaxy. Red, orange, dusty arms of infrared light blend together in one splotchy, swirling mess. Bright patches of speckled star formation dot the arms all over, some tiny and some large and complex. Soft, blue x-ray light is seen along a diagonal axis from the upper left to lower right, along with some small fuzzy dots speckling the image in seemingly unrelated ways. The center is bright white with relatively smaller magenta colored jets along the same diagonal axis.
August 25, 2025 at 3:06 AM
Reposted by saurabh w jha
starlights.bsky.social
very cool new result led by Steve Schulze focused on SN2021yfj - the first of a new supernova subclass, Type Ien (“one - e - n”). This star lost its H, He, & C layers, and shows strong emission from the inner S + Si layers !! Check out his Science Friday interview about this science!

🧪🔭☄️
scifri.bsky.social Science Friday @scifri.bsky.social · Aug 22
A supernova some 2.2 billion light-years from Earth lost its outer layers of hydrogen and helium, allowing scientists to get a glimpse of its inner shell. 🔭
What Lies Beneath The Outer Layers Of A Star?
Astronomers found a supernova whose lighter outer layers had been stripped away, revealing an inner shell rich in silicon and sulfur.
buff.ly
August 24, 2025 at 1:01 PM
sublunar.bsky.social
My favorite galaxy. Spot the difference between this image and my profile pic. #SN1998bu #M96
esa.int European Space Agency @esa.int · Aug 25
📸 This NASA/ESA #Hubble Space Telescope image shows spiral galaxy Messier 96, whose asymmetric appearance may be the result of a galactic tug of war... 🧪🔭

esahubble.org/images/potw2... @science.esa.int @stsci.edu #astronomy
Spiral galaxy Messier 96 tilted nearly face-on to us, with a slightly unusual shape. Its spiral arms form an oval-shaped ring around the galaxy’s disc, filled with blue light from stars, as well as pink glowing gas bubbles where new stars are forming. Threads of dark red dust swirl around the brightly glowing core, blocking some of its light. The dust lanes extend into and follow the spiral arms.
August 25, 2025 at 1:29 PM
Reposted by saurabh w jha
stsci.edu
#NASARoman’s High-Latitude Time-Domain Survey will find exploding stars that act as signposts to measure the universe’s expansion and the influence of dark energy. (1/6) 🧵 🔭 🧪
Two side-by-side images of a zoomed in portion of a galaxy, showing the same field of view. The left panel contains a very bright star with four diffraction spikes just left of center. In the right panel, the star is still visible but much fainter.
August 12, 2025 at 6:08 PM
Reposted by saurabh w jha
esa.int
📷 This NASA/ESA #Hubble image shows spiral galaxy NGC 1309, with its bluish stars, brown gas clouds and white centre, as well as hundreds of distant background galaxies (nearly every smudge, streak and blob is an individual galaxy!)🧪🔭 @stsci.edu @science.esa.int

🔗 esahubble.org/images/potw2...
A top-down view of a spiral galaxy, showing its brightly shining centre, its broad spiral arms and the faint halo around its disc, as well as distant galaxies and stars on a dark background. Large blue clouds of gas speckled with small stars and strands of dark dust swirl around the galaxy’s disc. A couple of the background galaxies are large enough that their own swirling spiral arms can be seen.
July 28, 2025 at 8:34 AM
Reposted by saurabh w jha
chanda.blacksky.app
📣📣 BOOK NEWS 📣📣

I'm excited to share the cover and release date of Book #2, #EdgeOfSpaceTime, which is now available for PREORDER!!

You can order from ANY bookstore, including your local indie!

More details on preordering here:
www.penguinrandomhouse.com/books/746817...

What's the book about? 🧵
[neon rainbow pattern background] THE EDGE OF SPACE-TIME The universe reimagined -- through pop culture, poetry, and theoretical physics. From the award-winning author of The Disordered Cosmos image of the cover of the book which features circular artwork in the center, one half of it a black and white pattern and the other half a neon rainbow pattern PREORDER NOW Coming 4/7/26 image of the Pantheon logo
July 28, 2025 at 2:05 PM
Reposted by saurabh w jha
chrchristensen.bsky.social
Talk about The Wire, Sopranos, Game of Thrones all you want, but the greatest US television program ever made is Sesame Street. It's not even close. 50+ years of treating kids across class, ethnicity, religion not as mini-consumers...but as citizens with a stake in this world.
July 18, 2025 at 11:06 AM
Reposted by saurabh w jha
sifill.bsky.social
An absolutely monumental piece from @polgreen.bsky.social this morning. Appreciate the research, array of sources, and nuanced thinking on the complicated issue of migration.
Gift link: www.nytimes.com/2025/01/31/o...
Opinion | Something Extraordinary Is Happening All Over the World
www.nytimes.com
July 9, 2025 at 11:46 AM
Reposted by saurabh w jha
minouette.bsky.social
Happy birthday to #astronomer Henrietta Swan Leavitt (1868-1921) who set the scale of our Universe. 🧪🐡👩🏼‍🔬🎢🔭#histsci Behind her in my portrait is a line showing stellar luminosity (capital L with subscript sun-symbol, a circle with a dot) as a function of time (t). She is printed over constellations 🧵
My linocut portrait of Henrietta Swan Leavitt is printed in silvery lavender ink on Japanese kozo (or mulberry paper). Behind her is a line showing stellar luminosity (capital L with subscript sun-symbol, a circle with a dot) as a function of time (t). She is printed over constellations in gold (Cepheus, Cassiopeia, Draco, Ursa Minor and Andromeda). ⁠ ⁠
July 4, 2025 at 11:46 AM
Reposted by saurabh w jha
vrubinobs.bsky.social
Introducing...your sneak peek at the cosmos captured by NSF–DOE Vera C. Rubin Observatory!

Can you guess these regions of sky?

This is just a small peek...join us at 11am US EDT for your full First Look at how Rubin will #CaptureTheCosmos! 🔭🧪

#RubinFirstLook
ls.st/rubin-first-look-livestream
A sprawling, textured field of galaxies scattered across the deep black of space. It is filled with the delicate smudges and glowing cores of galaxies of many shapes, sizes and colors, as well as the bright multi-colored points of stars. The image focuses on a collection of interacting galaxies connected by delicate streams of stars. At top center lies a large elliptical galaxy that is dense and smooth, like a polished stone glowing with golden light. Like delicate spider silk or stretched taffy, these stellar bridges link the large elliptical to the few larger galaxies beneath, evidence of past collisions. All throughout the image, thousands of galaxies gather in clusters or are spread throughout, like glittering gems strewn on a table. Some are sharp-edged and spiral, like coiled ribbons; others round and diffuse, like polished pebbles. Still others are just smudges of various colors against the black of space. The background is peppered with pinpoint stars in reds, yellows, and blues, crisp against the velvet black. A cosmic tapestry of glowing tan and pink gas clouds with dark dust lanes. In the upper right, the Trifid Nebula resembles a small flower in space. Its soft, pinkish gas petals are surrounded by blue gas, and streaked with dark, finger-like veins of dust that divide it into three parts. It radiates a gentle, misty glow, diffuse and soft like the warmth of breath on a cold hand. To the lower left, the much larger Lagoon Nebula stretches wide like a churning sea of magenta gas, with bright blue, knotted clumps sprinkled throughout where new stars are born. Both nebulae are embedded in a soft tan backdrop of gas that is brighter on the left than on the right, etched with dark tendrils of dust and sprinkled with the pinpricks of millions of stars. A sprawling, textured field of galaxies scattered across the deep black of space. It is filled with the delicate smudges and glowing cores of galaxies of many shapes, sizes and colors, as well as the bright multi-colored points of stars. To the lower left is a region filled with the hundreds of golden glittering gems of a distant galaxy cluster. In the foreground, below and right of center, two blue spiral galaxies look like eyes beneath the entangled mass of a triple galaxy merger in the upper right. A few bright blue points of foreground stars pierce the glittering tapestry. All throughout the image, thousands of galaxies gather in clusters or are spread throughout, like glittering gems strewn on a table. Some are sharp-edged and spiral, like coiled ribbons; others round and diffuse, like polished pebbles. Still others are just smudges of various colors against the black of space. The background is peppered with pinpoint stars in reds, yellows, and blues, crisp against the velvet black.
June 23, 2025 at 4:06 AM
Reposted by saurabh w jha
vrubinobs.bsky.social
Welcome to a new era in astronomy and astrophysics ✨🔭🧪

Get ready to join us virtually for the reveal of Rubin's first images! #RubinFirstLook
🗓️ June 23, 2025
⌚️ 11am US EDT
🔗 ls.st/rubin-first-look-livestream
ls.st
June 22, 2025 at 5:56 PM
Reposted by saurabh w jha
luckytran.com
Better save a copy of this now
CDC Table: Recommended Child and Adolescent Immunization Schedule for Ages 18 Years or Younger, United States, 2025
June 12, 2025 at 12:39 AM
Reposted by saurabh w jha
ogtelford.bsky.social
Delighted that the first paper from our Cy2 JWST program was published today, reporting the discovery of molecular hydrogen in the 3% Solar metallicity galaxy Leo P. This was a very fun project with @karinsandstrom.bsky.social strom.bsky.social and fabulous co-authors! www.nature.com/articles/s41...
Molecular hydrogen in the extremely metal- and dust-poor galaxy Leo P - Nature
Observations from the JWST MIRI-MRS instrument reveal the detection of rotational emission from molecular hydrogen near the only O-type star in the 3% solar metallicity galaxy Leo P, providing confirm...
www.nature.com
June 11, 2025 at 10:20 PM
Reposted by saurabh w jha
soto.space
If you are interested in supporting NASA science and exploration, and saving it from capricious budget cuts, here's one thing you can do: sign this petition being sent to Senate and House members of their respective appropriations committees. Two days left to sign!

www.planetary.org/advocacy-act...
Advocacy Action Center
The Planetary Society is organizing a new space constituency that is educated, empowered, and loud.
www.planetary.org
June 10, 2025 at 3:27 PM