Mars
noun
The fire star is Mars. This should be easy to remember, because Mars is the only planet in our solar system that's the color of fire.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
火星には水がありますか？
Does Mars have water?
できれば今すぐ火星に行きたいと思っています。
I would like to go to Mars right now if possible.
火星の日の入りは空が青く見えるそうです。
Apparently, the sunset sky looks blue on Mars.