s******o
发帖数: 298 | 1 By J. Kelly Beatty
April 16, 2002 | Sometimes a just little data can have powerful implications.
That's what happened when a team of radar astronomers used the Arecibo radio
telescope to observe a little asteroid dubbed 2000 DP107 as it swept past
Earth 18 months ago.
Surprisingly, the near-Earth space rock turned out to be "rocks," a pair of
bodies 2.6 kilometers apart that whirl around a common center every 42 hours.
From the radar echoes, Jean-Luc Margot (Caltech) also deduced that the two
ob |
|
