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Phew, we're safe!

Phew, we're safe!

作者:车正离镦  时间:2019-03-07 03:15:20  人气:

A faint streak of light recorded in 1955 has calmed fears about a catastrophic asteroid impact. After learning of the possible threat to Earth posed by asteroid 1999 AN10 (This Week, 5 June, p 5), two German amateur astronomers, Arno Gnädig and Andreas Doppler, calculated where it should have been during the 1955 Palomar sky survey. They then spotted it on a digitised image. From this information, Gareth Williams and Brian Marsden of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts, refined their calculations of the asteroid’s orbit. “We’re safe until sometime after 2076,