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This is CBS I in the World. I'm John Bachelors. Hotel Mars episode N. Dr. Space himself is

here. My colleague and co-pilot and we're very pleased to welcome our good colleague and

longtime friend, David Grinsman, the planetary institute to help us understand on the position

from Earth to Mars and from Earth to Venus. What are we waiting for? What are we learning from

the probes that are on the surface or in orbit or being built on Earth to head to orbit

or on the surface of these two planetary bodies? This is the intersolar system, the rocky

and wet stuff that we look for in exoplanets. So David, a very good evening to Dr. Grinspoon.

I begin with a report that got my attention. This is from NASA Goddard. Mars has two small

moons, Phobos and Demos. Phobos is gradually spiraling inward, drawing about six feet closer

to the planet each century. Within 50 million years, it will either crash into Mars or break

up and form a ring around the planet. It was the crashing part that got my attention. David,

does this put a limit on planetary colonies on the surface of Mars? Can we imagine Phobos as

a collision object? Good evening, John and David. It's an interesting question. It's a fun thing

to think about. If 50 million years is a long time, so I wouldn't say this ranks really high

on our concerns about going to Mars and surviving there and living there sustainably if that's

what we choose to do. We've got much more immediate problems to solve, but it is interesting to

...