Subreddit: Astronomy

Created on 28/03/2008. 2991287 subscribers.

Submissions

Read the rules sub before posting!

created by VoijaRisa on 27/03/2020 at 19:46 UTC* - 810 upvotes (https, www.reddit.com)

0 comments

Jupiter Last Night.

created by Correct_Presence_936 on 27/02/2025 at 18:14 UTC - 328 upvotes (https, i.redd.it)

3 comments

Sun from 2/22/25

created by rockylemon on 27/02/2025 at 20:00 UTC - 195 upvotes (https, www.reddit.com)

11 comments

Mercury Today in Broad Daylight.

created by Correct_Presence_936 on 27/02/2025 at 21:54 UTC - 91 upvotes (https, i.redd.it)

5 comments

Mars and its Moons Last Night.

created by Correct_Presence_936 on 27/02/2025 at 19:38 UTC - 62 upvotes (https, i.redd.it)

3 comments

The Daystar Yesterday; Venus.

created by Correct_Presence_936 on 27/02/2025 at 19:35 UTC - 20 upvotes (https, i.redd.it)

1 comments

Andromeda Galaxy

created by Dramatic_Expert_5092 on 26/02/2025 at 21:13 UTC - 754 upvotes (https, i.redd.it)

8 comments

Mars Last Night. The Polar Ice Cap is Shrinking as Summer Starts in the North.

created by Correct_Presence_936 on 26/02/2025 at 19:55 UTC - 505 upvotes (https, i.redd.it)

14 comments

the Western Veil Nebula

created by DecisiveUnluckyness on 26/02/2025 at 22:45 UTC - 193 upvotes (https, i.redd.it)

1 comments

Horsehead and Flame Nebula

created by Sufficient_Wasabi665 on 26/02/2025 at 22:25 UTC - 200 upvotes (https, i.redd.it)

15 comments

Do processes at the far reaches of the observable universe appear to take less time due to the expansion of the universe due to special relativity?

created by allez2015 on 27/02/2025 at 13:15 UTC* - 10 upvotes (https, www.reddit.com)

8 comments

Hoping someone has advice for seeing the planetary alignment and knowing which objects are planets vs stars!

created by No-Midnight-1627 on 28/02/2025 at 01:02 UTC - 1 upvotes (https, www.reddit.com)

1 comments

Help - my first PhD interview in astronomy is tomorrow!

created by Suitable-Photograph3 on 27/02/2025 at 02:54 UTC - 38 upvotes (https, www.reddit.com)

21 comments

Openstax Astronomy 2e Chapter Slides

created by ChanceDealer3473 on 27/02/2025 at 21:21 UTC - 1 upvotes (https, www.reddit.com)

0 comments

Traversing beyond the 'observable' universe

created by 8A8 on 27/02/2025 at 21:19 UTC - 1 upvotes (https, www.reddit.com)

15 comments

M82, NGC 3034 - Cigar Galaxy

created by prot_0 on 26/02/2025 at 14:55 UTC - 262 upvotes (https, i.redd.it)

8 comments

Navigating the Star Field: Tips for Using 8x42 Binoculars in Astronomy

created by general_Purple134 on 27/02/2025 at 15:37 UTC - 2 upvotes (https, www.reddit.com)

2 comments

NTX planet alignment 2/28

created by textumbleweed on 27/02/2025 at 23:43 UTC - 0 upvotes (https, www.reddit.com)

1 comments

Almanac Planetarium

created by horwastaken on 27/02/2025 at 17:43 UTC* - 0 upvotes (https, www.reddit.com)

0 comments

Is this just a coincidence?

created by BrandonSG1 on 26/02/2025 at 22:10 UTC - 26 upvotes (https, www.timeanddate.com)

1 comments

Roughly 2 hours on the Soul Nebula in Cassiopeia

created by Dependent_Story_144 on 26/02/2025 at 05:00 UTC - 504 upvotes (https, i.redd.it)

4 comments

Why doesn't CMB heat Boomerang Nebula ? I was listening to this documentary and learned that Boomerang is cooler than CMB. How could that be? Is it constantly being cooled by escaping gas from its binary star that keeps temperature lower than CMB or is there something else at play here?

created by InterestingRepair500 on 26/02/2025 at 20:28 UTC - 26 upvotes (https, theturingapp.com)

5 comments

Study investigates outburst of cataclysmic variable system GK Persei

created by tahalive on 26/02/2025 at 14:40 UTC - 13 upvotes (https, phys.org)

0 comments

How worse is Gran Canaria for a Astronomy tour in comparison to La Palma?

created by bloodscar36 on 26/02/2025 at 17:00 UTC - 7 upvotes (https, www.reddit.com)

15 comments

Flaming star and Tadpole Nebula

created by jcat47 on 25/02/2025 at 21:18 UTC - 145 upvotes (https, i.redd.it)

1 comments