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Astronomy and observational science

Cosmology, galaxies, stars, planets, astronomical observations, telescopes, and observatory instruments.

16,958 stories · 164 in 30 days · Updated Sep 28, 2026

The pace of conversation

Posts per month

2020-01: 261 posts2020-02: 196 posts2020-03: 151 posts2020-04: 211 posts2020-05: 179 posts2020-06: 278 posts2020-07: 260 posts2020-08: 205 posts2020-09: 239 posts2020-10: 219 posts2020-11: 177 posts2020-12: 251 posts2021-01: 212 posts2021-02: 164 posts2021-03: 243 posts2021-04: 167 posts2021-05: 194 posts2021-06: 240 posts2021-07: 186 posts2021-08: 185 posts2021-09: 181 posts2021-10: 209 posts2021-11: 189 posts2021-12: 304 posts2022-01: 319 posts2022-02: 196 posts2022-03: 209 posts2022-04: 181 posts2022-05: 234 posts2022-06: 204 posts2022-07: 298 posts2022-08: 228 posts2022-09: 215 posts2022-10: 203 posts2022-11: 232 posts2022-12: 183 posts2023-01: 237 posts2023-02: 186 posts2023-03: 191 posts2023-04: 191 posts2023-05: 220 posts2023-06: 241 posts2023-07: 217 posts2023-08: 241 posts2023-09: 263 posts2023-10: 266 posts2023-11: 247 posts2023-12: 235 posts2024-01: 240 posts2024-02: 274 posts2024-03: 267 posts2024-04: 255 posts2024-05: 268 posts2024-06: 210 posts2024-07: 196 posts2024-08: 171 posts2024-09: 193 posts2024-10: 251 posts2024-11: 180 posts2024-12: 174 posts2025-01: 219 posts2025-02: 151 posts2025-03: 169 posts2025-04: 192 posts2025-05: 195 posts2025-06: 213 posts2025-07: 246 posts2025-08: 167 posts2025-09: 179 posts2025-10: 186 posts2025-11: 194 posts2025-12: 155 posts2026-01: 177 posts2026-02: 124 posts2026-03: 163 posts2026-04: 195 posts2026-05: 138 posts2026-06: 123 posts2026-07: 195 posts2026-08: 199 posts2026-09: 161 posts
2020-012026-09

Posts per month · first and latest months may be partial.

01 / EXPLORE THROUGH TIME

Timeline

Start with the latest. Scroll back through time, or zoom in for more.

Year by yearUp to 5 stories per year
20261,475 stories
Lunar Flyby↗ nasa.gov · HN · 245 comments · 964 points · Apr 07, 2026
Artemis II crew take “spectacular” image of Earth↗ bbc.com · HN · 387 comments · 1077 points · Apr 03, 2026
My astrophotography in the movie Project Hail Mary↗ rpastro.square.site · HN · 200 comments · 911 points · Mar 22, 2026
Why is the sky blue?↗ explainers.blog · HN · 270 comments · 813 points · Feb 09, 2026
Level S4 solar radiation event↗ swpc.noaa.gov · HN · 198 comments · 628 points · Jan 19, 2026
20252,266 stories
Voyager 1 is about to reach one light-day from Earth↗ scienceclock.com · HN · 395 comments · 1088 points · Nov 26, 2025
A new pyramid-like shape always lands the same side up↗ quantamagazine.org · HN · 158 comments · 656 points · Jun 25, 2025
Vera C. Rubin Observatory first images↗ rubinobservatory.org · HN · 166 comments · 579 points · Jun 23, 2025
If the moon were only 1 pixel: A tediously accurate solar system model (2014)↗ joshworth.com · HN · 261 comments · 936 points · Jun 13, 2025
Hyperspace↗ hypercritical.co · HN · 456 comments · 849 points · Feb 25, 2025
20242,679 stories
Moon↗ ciechanow.ski · HN · 250 comments · 3128 points · Dec 17, 2024
First images from Euclid are in↗ dlmultimedia.esa.int · HN · 396 comments · 1413 points · Oct 21, 2024
Most of Europe is glowing pink under the aurora↗ foto-webcam.eu · HN · 378 comments · 1623 points · May 10, 2024
Webb captures iconic Horsehead Nebula in unprecedented detail↗ esa.int · HN · 301 comments · 1078 points · Apr 29, 2024
Equinox.space↗ equinox.space · HN · 326 comments · 1639 points · Apr 22, 2024
20232,735 stories
Cathedral, Mountain, Moon↗ apod.nasa.gov · HN · 18 comments · 150 points · Dec 26, 2023
Constellations are younger than continents↗ lesswrong.com · HN · 123 comments · 307 points · Dec 25, 2023
Why does the moon change size when you snipe it in GTA?↗ insiderockstarnorth.blogspot.com · HN · 9 comments · 73 points · Nov 21, 2023
Astral↗ astral.sh · HN · 43 comments · 116 points · Apr 18, 2023
The James Webb Space Telescope is finding too many early galaxies↗ skyandtelescope.org · HN · 30 comments · 82 points · Jan 12, 2023
20222,702 stories
Someday aliens will land and all will be fine until we explain our calendar↗ twitter.com · HN · 989 comments · 1514 points · Sep 25, 2022
Compare Webb's Images to Hubble↗ johnedchristensen.github.io · HN · 244 comments · 1636 points · Jul 12, 2022
Deepest infrared image of universe↗ nasa.gov · HN · 347 comments · 1136 points · Jul 11, 2022
Sunsetting Atom↗ github.blog · HN · 853 comments · 1320 points · Jun 08, 2022
James Webb is fully deployed↗ nasa.gov · HN · 494 comments · 1384 points · Jan 08, 2022
20212,474 stories
Hubble telescope has new lease on life after computer swap appears to fix glitch↗ sciencemag.org · HN · 231 comments · 629 points · Jul 16, 2021
A dwarf planet coming within 11 AU of the sun over the next 10 years↗ groups.io · HN · 309 comments · 638 points · Jun 20, 2021
Milky Way, 12 years, 1250 hours of exposures and 125 x 22 degrees of sky↗ astroanarchy.blogspot.com · HN · 139 comments · 659 points · Mar 17, 2021
NASA's Perseverance rover sends stunning images↗ bbc.com · HN · 347 comments · 1032 points · Mar 03, 2021
New 10 Terapixel Image of the Night Sky Contains 1B Galaxies↗ viewer.legacysurvey.org · HN · 252 comments · 523 points · Feb 08, 2021
20202,627 stories
Drone Footage of Arecibo Observatory Collapse↗ nsf.gov · HN · 229 comments · 892 points · Dec 03, 2020
Arecibo Observatory Collapsed↗ space.com · HN · 309 comments · 776 points · Dec 01, 2020
Arecibo telescope, on the brink of collapse, will be dismantled↗ sciencemag.org · HN · 301 comments · 830 points · Nov 19, 2020
First Ever Image of a Multi-Planet System Around a Sun-Like Star Captured by ESO↗ eso.org · HN · 171 comments · 654 points · Jul 22, 2020
Mount Everest is visible from Kathmandu for first time in living memory↗ snowbrains.com · HN · 267 comments · 615 points · May 21, 2020
Scroll through time ↕

02 / CATCH UP

The conversation now

Popular stories, with attention fading over roughly two weeks.

No Man's Sky Cosmos↗ nomanssky.com · HN · 471 comments · 458 points · Sep 09, 2026
Lunar Terminator Paradox↗ notes.secretsauce.net · HN · 64 comments · 99 points · Sep 27, 2026
Promising discoveries about the potential for life on one of Saturn’s icy moons↗ fu-berlin.de · HN · 72 comments · 98 points · Sep 26, 2026
Biggest dark matter detector spots a single weird particle↗ science.org · HN · 150 comments · 346 points · Sep 02, 2026
Black Holes or Black Hole Stars? Astronomers Spar over 'Little Red Dots'↗ quantamagazine.org · HN · 61 comments · 105 points · Sep 18, 2026

03 / GO DEEPER

Follow your curiosity

Find a particular story, revisit a year, or see what resonated.

Highest rated · the last 30 days

No Man's Sky Cosmos↗ nomanssky.com · HN · 471 comments · 458 points · Sep 09, 2026
Biggest dark matter detector spots a single weird particle↗ science.org · HN · 150 comments · 346 points · Sep 02, 2026
Icy Moons Are Ocean Worlds↗ mceglowski.substack.com · HN · 49 comments · 222 points · Sep 06, 2026
'Fingerprints' inside the Sun could reveal if it once swallowed a planet↗ ras.ac.uk · HN · 42 comments · 133 points · Sep 13, 2026
Astronomers Detect a 10-Sided Structure in Saturn's Atmosphere↗ sciencealert.com · HN · 39 comments · 108 points · Sep 03, 2026
Black Holes or Black Hole Stars? Astronomers Spar over 'Little Red Dots'↗ quantamagazine.org · HN · 61 comments · 105 points · Sep 18, 2026
Lunar Terminator Paradox↗ notes.secretsauce.net · HN · 64 comments · 99 points · Sep 27, 2026
Promising discoveries about the potential for life on one of Saturn’s icy moons↗ fu-berlin.de · HN · 72 comments · 98 points · Sep 26, 2026
A Small Telescope That Surprised Me↗ adfr.io · HN · 93 comments · 95 points · Sep 01, 2026
NASA: Fill in a name, and you can have an exclusive coordinate in the universe↗ science.nasa.gov · HN · 61 comments · 71 points · Sep 01, 2026

10 stories shown.

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