February 28th, 2013
05:26 PM ET

Tito: Mission to Mars is possible

CNN's Erin Burnett spoke to millionaire Dennis Tito about his ambitious plan to send a middle-aged married couple to the Red Planet. Check out the video, above.

Read more about Tito's plan


Filed under: In Space • Mars
Planet of sound: Meteor blast resonated around Earth
A large chunk of a meteor that exploded over Russia is found in a lake on Friday, February 15.
February 28th, 2013
09:43 AM ET

Planet of sound: Meteor blast resonated around Earth

By Matt Smith, CNN

The meteor that exploded over the steppes of southwestern Russia sent a low-frequency rumble bouncing through the Earth, giving scientists new clues about the biggest cosmic intruder in a century.

The big boom over Chelyabinsk on February 15 also produced a wave of sound thousands of times lower than a piano's middle C - far below the range of human hearing, according to the international agency that watches for nuclear bomb tests. The Comprehensive Test Ban Treaty Organization said that sound wave showed up on sensors from Greenland to Antarctica, making it the largest ever detected by its network.

Scientists then used that wave to calculate the size of the small asteroid that plunged to Earth, said Margaret Campbell-Brown, an astronomer at Canada's University of Western Ontario.

FULL STORY from CNN.com

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