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Hubble Space Telescope observes 'Moon bombing' |
NASA's Hubble Space Telescope has made a series
of observations of the Lunar Crater Observation and Sensing Satellite's (LCROSS)
'Moon bombing' mission. Hubble's Wide Field Camera 3 (WFC3) and Space Telescope
Imaging Spectrograph (STIS) were pointed just off the southern limb of the Moon
to look for a cloud of vaporized material blasted into space by the successive
impacts of the rocket booster and spacecraft on October 9. At 7:31 a.m. ET on
October 9, a 2.2-ton empty rocket shot from the LCROSS probe hit the crater Cabeus
A on the moon's south pole. Four minutes later, LCROSS (Lunar Crater Observation
and Sensing Satellite) performed its own kamikaze dive, which was the final act
in its mission to detect evidence of water ice in the moon's shadowed craters.
The WFC3 images do not show any evidence for a temporary exosphere resulting from
the impacts. Hubble's ultraviolet sensitivity allowed astronomers to look specifically
for hydroxyl (OH) that would have been produced by vaporized material from the
impact. The STIS and WFC3 looked for emission from OH which would have formed
if water molecules had been thrown into sunlight and broken apart by ultraviolet
radiation into hydrogen and hydroxyl. "A preliminary analysis of the STIS spectra
do not show any clear evidence for hydroxyl, but further analysis is needed,"
said Hubble co-investigator Alex Storrs. The Hubble team plans on further analysis
of their data. The Hubble Space Telescope is a project of international cooperation
between NASA and the European Space Agency. |
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