The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

...on a surface located
at the farthest reaches of our COSMOS.
The Big Bang Theory Season 6, Episode 5

Peering through his telescope
at the birth of the COSMOS.
The Big Bang Theory Season 6, Episode 1

...populating a gigantic COSMOS.
The Big Bang Theory Season 4, Episode 20

Do a good job and I'll tell you
Cosmo's ten dynamite tips
The Big Bang Theory Season 7, Episode 20