# Does astro means space or stars [closed]

In the popular TV show The Big Bang Theory Season 3, Episode 4, Sheldon Cooper said that astro means star and Raj said astro means space, I got a little confused here, various websites and others are going 50-50 on the subject. What does astro actually means?

Raj: No, no, no, no! That rate is much too low for what we’d expect from this collision. Do you understand that we’re talking about dark matter colliding in outer space?

Sheldon: Of course I understand. And who are you to tell me about outer space?

Raj: I’m the astrophysicist. Astro means space.

Sheldon: Astro means star.

• Why do you think it is an either or question? – samcarter_is_at_topanswers.xyz Aug 22 '19 at 12:18
• Do you mean definitive in the sense of how it was used originally in Greek or what it is used for today? – called2voyage Aug 22 '19 at 14:44
• This might be better on English Language, as it is not about astronomy but about the meaning of prefix in the Language. – James K Aug 22 '19 at 15:51
• I'm voting to close this question as off-topic because the meaning can be easily found in a dictionary. – James K Aug 22 '19 at 18:12
• I'm voting to leave this question open because definitions of astronomy terms is absolutely on topic, and we shouldn't just use "off-topic" to close for any reason we feel like using it for. We have a terminology tag, let it be used. – uhoh Aug 22 '19 at 23:09

Astro comes from the greek άστρο which not only means star but has a more general meaning that includes any small dot in the night sky (see https://en.wiktionary.org/wiki/%CE%AC%CF%83%CF%84%CF%81%CE%BF#Greek for details)

In today's language it still has a quite broad meaning: