Watch: Rare comet seen from Earth for first time since Stone Age
The 'Green Comet' has an intense green hue resulting from the sun's rays and was last seen when the 'world's population fit into Cleveland.'
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Comet
News and updates about Comet
NASA scientist warns of 'extinction-level' asteroid strike
NASA scientist warns that Earth is due for an 'extinction-level' event like a comet or asteroid strike and 'we won't be able to stop it.'
Watch: First Images from Historic Comet Landing
After 15 years, 4 billion miles and several hours of nail-biting tension, ESA's robot lander makes history with first-ever comet landing.
One-of-a-Kind Meteorite Shower Expected Overnight Friday
Stargazers can expect to see up to 200 meteorites per hour, experts say. Find out when here.
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