Why do we think that dark matter exists?​

To explain the unexplained motions of the stars in the galaxies.

Explanation:

Scientists study dark matter by looking at the effects it has on visible objects. Scientists believe that dark matter may account for the unexplained motions of stars within galaxies. ... They allow scientists to create models which predict galaxy behavior. Satellites are also being used to gather dark matterinformation.

gays

explanation:

well let's see i know a little about the fall of the roman empore but what to say i do not have a clue of what to say. (that's 28 words) i learned about it in social studies it was quite boring really my teacher talks a lot, like a lot then gives us a bunch of work sheets not too many though.( that's 60 words)i actually almost fell asleep in class of course i really like that teacher of course she is really nice. i actually don't remember much from that class i got a b without any notes (it was an open notes test)(that's 95 words) i'm wasting time but i've gone too far to stop now i'm sorry i haven't said really any thing on the topic at all sorry not sorry haha jk.(that's 125 words ) (mike drop)