r/spacequestions

2.3K archived posts · Oct 2013 – Sep 2026

spacequestions: for all your questions about space

r/spacequestions

SpaceQuestions is a subreddit for asking questions about astronomy, rocketry, astrophysics and cosmology. We welcome everyone to post questions to satisfy their curiosity and further their scientific understanding. Our most common questioners fit into two categories: the scientifically curious, and fiction authors wanting to add realism into their stories. Please be courteous in your replies and help everyone to learn more about space together.

Created Oct 14, 2013

7.7KMembers (last snapshot)

2.3KArchived posts

Welcome to r/spacequestions, a subreddit dedicated to knowledge about space. Do you have questions about or related to space? This is the place for answers!

All questions about space are welcome here, from the simple to the complex. Do you have questions about astronomy? Launch vehicles? Space agencies? Space science? All is welcome.

Anyone may answer a question, though we ask that you try to be accurate.

The rules:

All posts must be a question about space. This includes astronomy, space science, space launch systems... anything related to space! Posts that do not follow this rule will be removed.
Self posts only. If you have a question about an image, please link to it in your self post.
Avoid memes or jokes in self-posts, and do not post them as top level comments. Such comments may be removed.
Avoid baseless speculation.
Be nice to each other.

Related subreddits:

r/space

r/spaceflight

r/spaceporn

r/ImaginaryStarscapes

Other communities

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