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Dangerous rendezvous - Comet
‘Siding Spring’ headed for close encounter with Mars
Mars is about to dodge a
cosmic snowball on this Sunday. On October 19, Comet Siding Spring will pass
within 88,000 miles of Mars – just one third of the distance from the Earth to
the Moon! Traveling at 33 miles per second and weighing as much as a small mountain,
the comet hails from the outer fringes of our solar system, originating in a
region of icy debris known as the Oort cloud.
Comets from the Oort cloud are both ancient and rare. Since this is Comet Siding Spring’s first trip through the inner solar system, scientists are excited to learn more about its composition and the effects of its gas and dust on the Mars upper atmosphere. NASA will be watching closely before, during, and after the flyby with its entire fleet of Mars orbiters and rovers, along with the Hubble Space Telescope and dozens of instruments on Earth. The encounter is certain to teach us more about Oort cloud comets, the Martian atmosphere, and the solar system’s earliest ingredients.
Oort Cloud
http://en.wikipedia.org/wiki/Oort_cloud
Source and further reading:
http://mars.jpl.nasa.gov/comets/sidingspring/
Comets from the Oort cloud are both ancient and rare. Since this is Comet Siding Spring’s first trip through the inner solar system, scientists are excited to learn more about its composition and the effects of its gas and dust on the Mars upper atmosphere. NASA will be watching closely before, during, and after the flyby with its entire fleet of Mars orbiters and rovers, along with the Hubble Space Telescope and dozens of instruments on Earth. The encounter is certain to teach us more about Oort cloud comets, the Martian atmosphere, and the solar system’s earliest ingredients.
Oort Cloud
http://en.wikipedia.org/wiki/Oort_cloud
Source and further reading:
http://mars.jpl.nasa.gov/comets/sidingspring/
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