He is a cigar smoking wise cracking racoon in space who carries an oversize gun around with him. "Oh, and in case there is any doubt that the “Rocky” who showed up in Marvel Preview is the actual Rocket Raccoon who will appear in the movies, in an afterward to his Rocket Raccoon #1 in 1985, Bill Mantlo does specifically state that Rocky and Rocket are the same character. So there you have it, True Believers, the first appearances and origin of Rocket Raccoon." https://bamsmackpow.com/2014/08/08/first-appearances-rocket-raccoon-retro-review/
So, we now know that Rocket Racoon is immortal, or time travels, or can dimension jump to Earth 7614, as Preview 7 takes place 10,000 years in the future