r/space

Science subreddit · 27.8M members

Share & discuss informative content on: Astrophysics Cosmology Space Exploration Planetary Science Astrobiology

— r/space sidebar description
Open r/space on Reddit →
Members
27,810,026 (July 2025)
Size rank
#15 of 2,960 subreddits we track, larger than 99% of them
Topic
Science · #2 of 39 in Science
Reddit category
Lifestyles
Address
reddit.com/r/space · how to join

Subreddits like r/space

Communities whose topic and description overlap most with r/space. Of these, r/science is the biggest at 34.2M members, about 1.2× the size of r/space.