'Only about 25 asteroids with orbits completely within Earth's orbit have been discovered to date because of the difficulty of observing near the glare of the sun.'
Asteroid apocalypse: How big must a space rock be to end human civilization?
"So far we have found two large near-Earth asteroids that are about 1 kilometer [0.6 miles] across, a size that we call planet killers," Sheppard said.
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