Came outside to smoke a cigar and saw a bright fire ball travelling south at a constant speed and then slowing down and then dim!

I've seen these fireballs in June of this year and before in May of 2020! They usually come in twos one behind the other. My first time seeing them was in June of 2016! They are so hot coming in at a cruising speed and then as they descend into the atmosphere they start to cool and turn dark orange and keep cruising til u can't see them in the night sky. I saw one going East in June and tonight this one was going south.! Why are they here? What are they doing? One thing is I've seen em enough to start believing! The first couple of times I was in doubt. And I know they have to see them! As I write them it just came back and flashed me and my brother as I was telling him!