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Once the asteroid arrives it will be easier to send up astronauts to examine it close-up.
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It could be that climatic features had destabilized the ecosystem before the asteroid arrived.
Though comet hunter Eugene Shoemaker estimated that in Earth's early history only a few percent of comets or asteroids arrived at low enough angles, the bombardment would have been heavy enough to deliver a significant amount of intact organic material and water, according to Blank's estimates.
So this killer-asteroid news arrived with a certain measure of, shall we say, impact.
Judging from its orbit, 2001-D47 was not a recently arrived asteroid; rather, it had to have already made several loops around the Earth-moon system, including a near collision with the moon on 19 August 2000.
Life on Earth could have been blasted into space by asteroid collisions and arrived on the moons of Jupiter in a process called lithopanspermia.
Because our a priori knowledge regarding those conditions is limited, quantitative discussion of these considerations is difficult before the spacecraft arrives at the asteroid.
Further out, new dust continually arrives from passing comets, collisions between asteroids, and interstellar debris that wafts through the galaxy.
NASA's Osiris-Rex mission is scheduled to arrive at asteroid Bennu later this year, and plans to return a sample of the asteroid to Earth in 2023.
NASA's OSIRIS-REx sample-return spacecraft, carrying MIT instrument, arrived at asteroid in December; now begins the science to select a sampling location.
Next July, the craft will depart for Ceres, another large asteroid, where it will arrive in 2015.
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CEO of Professional Science Editing for Scientists @ prosciediting.com