There is another factor to consider: The Habitable Zone. This is the area within a galaxy that is habitable by life. Too close to the galactic centres, and all the supernovae explosions will have sterilised the planets with gamma rays, so no life around the oldest stars.

I think there is life on the other planets. That thing would not be impossible! Remember that we are not yet exploring all the parts of the universe!

No one knows for sure. But the only way to find out is to go to another planet. (Ain't going to happen!)

Eating at least 2 servings of fruits and vegetables a day. That would help you get started.