Enormous asteroid the size of Germany which would wipe out all life on earth if it hit
An asteroid discovered over 200 years ago which is roughly the size of Germany would have catastrophic consequences for life ...
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"We've Been Wrong For A Long Time": Protoplanetary Disks Are Much Smaller Than We Thought
The smallest disk identified, meanwhile, stretched to just 0.6 AU – closer to the star than the Earth is to the Sun.