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.

...that's been traipsing around
the SOLAR system for billions of years...
The Big Bang Theory Season 2, Episode 4

may have discovered
a new planet in our SOLAR system?
The Big Bang Theory Season 9, Episode 16

You know, last time, I was able to book
a cruise to the Arctic to see a SOLAR eclipse.
The Big Bang Theory Season 1, Episode 5

...that means 3.9 times 10
to the 15th SOLAR neutrinos?
The Big Bang Theory Season 8, Episode 19

Model of the SOLAR system,
developed by Nicolaus Copernicus...
The Big Bang Theory Season 6, Episode 4