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What's the biggest threat from outer space to our planet?
Encyclopedia Research
Wikipedia:
Planet
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Further Research
asteroid threat map
www.space.com
biggest planet in our Solar System
www.universetoday.com
Real threats from outer space (photos)
www.zdnet.com
Sizing Up the Threat from Near-Earth Objects (NEOs)
www.planetary.org
These Threats From Outer Space Could End Life on Earth
www.newsweek.com