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.
かせい
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.