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 The Maven spacecraft was scheduled to blast off aboard an unmanned
Atlas V rocket Monday afternoon.
NASA is sending Maven to Mars to study its upper atmosphere.
Scientists want to know why Mars went from being warm and wet during
its first billion years, to the cold and dry place it is today.
The early Martian atmosphere was thick enough to hold water and
possibly support microbial life. But much of that atmosphere may
have been lost to space, eroded by the sun.
"Something clearly happened," the University of Colorado's Bruce
Jakosky, the principal Maven scientist, said on the eve of Maven's
flight. "What we want to do is to understand what are the reasons
for that change in the climate."
Maven — bearing eight science instruments — will take 10 months to
reach Mars, entering into orbit around the red planet in September
2014.
The mission costs $671 million.
A question underlying all of NASA's 21 Mars missions to date is
whether life could have started on what now seems to be a barren
world.
"We don't have that answer yet, and that's all part of our quest for
trying to answer, 'Are we alone in the universe?' in a much broader
sense," said John Grunsfeld, NASA's science mission director.
Maven stands for Mars Atmosphere and Volatile Evolution, with a
capital "N'' in EvolutioN.
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It is NASA's 21st shot at Mars. Fourteen of the previous 20 missions
have succeeded, the most recent being the Curiosity rover that was
launched in 2011 and landed in 2012.
That's a U.S. success rate of 70 percent. No other country comes
close.
Curiosity's odometer reads 2.6 miles after more than a year of
roving. An astronaut could accomplish that distance in about a day
on the Martian surface, Grunsfeld noted Sunday.
Grunsfeld, a former astronaut, said considerable technology is
needed, however, before humans can fly to Mars in the 2030s, NASA's
ultimate objective.
The launch is scheduled for 1:28 p.m. from Cape Canaveral Air
Force Station.
___
Online:
NASA: http://www.nasa.gov/maven/
University of Colorado:
http://lasp.colorado.edu/home/maven/ [Associated
Press; MARCIA DUNN, AP Aerospace Writer]
Copyright 2013 The Associated
Press. All rights reserved. This material may not be published,
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