CNN's Gary Tuchman reports on survivors of the Japan quake staying at a shelter.
When China decided to test an anti-satellite missile in 2007, the impact shattered not just the target satellite but any illusions that China did not have military intentions in space and the capabilities to achieve them.
The Pentagon is reviewing its policy concerning the access by military personnel to social networking Web sites such as Facebook and Twitter, a spokesman said Tuesday.
The U.S. Marine Corps has banned access to social networking Web sites. CNN's Chris Lawrence reports.
The U.S. Marine Corps has banned Twitter, Facebook, MySpace and other social media sites from its networks, effective immediately.
The U.S. military has spent at least $100 million defending its computer network from and responding to cyberattacks, according to a top official responsible for network security.
Sonic booms and at least one fireball in the sky were reported in Texas on Sunday, less than a week after two satellites collided in space and a day after the Federal Aviation Administration asked U.S. pilots to watch for "falling space debris," authorities said.
Two satellites, one Russian and one American, have collided some 800 kilometers (500 miles) above Siberia, the Russian and U.S. space agencies, said Thursday.
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