The Sciences

Age of Mars Questioned

By Alex StoneJul 24, 2005 12:00 AM

Newsletter

Sign up for our email newsletter for the latest science news
 

High-resolution images from the Mars Global Surveyor are throwing into doubt conventional assumptions about the Red Planet’s craters.

For years astronomers believed they accumulated over long periods of time as the planet was repeatedly hit by small meteors. Therefore, the more craters, the older the planet must be. New images indicate that most of the cavities are secondary impacts from rocks kicked up when large asteroids hit. “Most of the craters are highly nonuniform in how they are distributed across the planet,” says planetary geologist Alfred McEwen of the University of Arizona in Tucson. “The surface can go from being free of craters to being full of craters in an instant,” he says. The upshot is that despite its pockmarked appearance, the surface of Mars may be hundreds of millions of years younger than previously thought.

1 free article left
Want More? Get unlimited access for as low as $1.99/month
Already a subscriber? Log In or Register
1 free articleSubscribe
Want unlimited access?

Subscribe today and save 70%

Subscribe

Already a subscriber? Log In or Register
More From Discover
Recommendations From Our Store
Shop Now
Stay Curious
Join
Our List

Sign up for our weekly science updates.

 
Subscribe
To The Magazine

Save up to 70% off the cover price when you subscribe to Discover magazine.

Copyright © 2021 Kalmbach Media Co.