because they cant support life. They don't have the right atmosphere or the right temperatures. Hopefully they discover a planet that will be able to support life.
It rotates backwards.
i dont know ask someone else!
The other planet's are too hot or too cold and don't have an atmosphere, therefore killing everything.
no they dont produce for other animals and humans and they dont consume anything.
Planets are not rings, of anything.
i dont know i want to find this out too hehe
terrestrial
It is very expensive to put anything in orbit never mind take it to another planet
yes there are seasons like earth on other planets. Except, they all dont have the same tempuratures or the same period one or more season lasts.
dont do anything you can hert your friendship
I DONT KNOW
i dont knoww