Near Earth Objects (NEOs) is anything in space that comes too close to Earth (within 1.3...

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Near Earth Objects (NEOs) is anything in space that comes tooclose to Earth (within 1.3 AU) and is sufficiently large. Describetwo challenges astronomers face in finding NEOs.
Additionally, scientist distinguish between potentiallyhazardous objects (140m or larger) and hazardous objects (largerthan 1km). What would happen to Earth if an object greater than 1kmcollided with the planet?
What would happen to Earth if a potentially hazardous objectcollided with the planet?

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Observations to determine size of NEOs are rarely made because they require specialized techniques such as radar or thermal infrared radiometry rather the size of an NEO is estimated from its brightness Sizes estimated this way are uncertain by about a factor of 2 to 4 In most cases sufficient observation of an object will establish that the chances of its colliding with Earth are negligible This happens when the object is small and discovered while passing very close See Answer

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