Every One Of Marvel Canine Cosmo's Powers And Abilities Explained

If you've ever had a dog, you know it's a sad fact of life that dogs don't live as long as humans. But this isn't something that keeps Cosmo up at night, since her lifespan seems to have been amplified substantially. 

Cosmo is a Golden Retriever/Labrador mix, also known as a Goldador. According to Travelling With a Dog, a Goldador's natural lifespan is around ten to 12 years. That's with healthy food, a lot of exercise, and quality veterinary health care, a bunch of things Cosmo does not have.

Nevertheless, because Cosmo lives in Knowhere, she's not eating standard-issue kibble — so perhaps her diet is even better. Granted, she does love treats, which Rocket provides, but other than that, it's anyone's guess what she's eating. The proof is in the pudding: Cosmo is much older than any Goldador has a right to be. The exact date is unknown, but Cosmo was first launched into Earth orbit sometime in the 1960s.

Cosmo first appeared in the comics in 2007, so, at the very least, Cosmo has been away from Earth for 38 years (if the launch took place in 1969). There may be some relativistic time dilation involved, but no matter how you look at it, Cosmo should have died decades ago. Seeing as the character doesn't age in any obvious way, Cosmo may, in fact, be functionally immortal; she has such a slow rate of aging it looks as if she doesn't age at all.