Curiosity just landed and, guess what: NASA wants to do it all over
again. InSight, a mission to study the interior of Mars, has been
approved by NASA with a planned launch of March 2016.

This wasn't the only proposal that NASA considered -- there was a push
to explore Titan, a moon orbiting Saturn, as well as a proposal to send
a spacecraft to land on a comet.

A Titan trip could have been pretty exciting. The moon is the largest of
those orbiting Saturn and its atmosphere is impenetrable by telescopes
and cameras, NASA explains. Scientists are drawn to it because it's the
only moon in the solar system that has clouds and a "planet-like
atmosphere."

Pictures of Titan from the Hubble Space Telescope in 1994 gave the
impression that there was a large "continent," but scientists couldn't
determine from the photos if there were liquid seas.  Considering that
the temperature is thought to be nearly minus-300 degrees Fahrenheit,
one would think any water would be solid ice.

It's a mystery -- which won't be solved in 2016.

The upcoming mission will look at the interior of Mars, as Los Angeles
Times science writer Amina Khan reported Tuesday:

"InSight's instruments will be designed to pick up any seismic activity
rumbling through the planet; take note of any meteor impacts on the
surface; burrow as much as 16 feet deep to study how heat flows
underground; and measure how Mars' two moons exert tidal forces on the
planet, causing it to stretch one way or another."

The decision on this second Mars mission predated the Curiosity rover
landing.

John Grunsfeld, associate administrator for NASA's Science Mission
Directorate in Washington, told Khan that NASA wanted to keep the two
decisions separate.

http://www.latimes.com/news/nation/nationnow/la-na-nn-mars-insight-2016-
mission-20120821,0,4288375.story

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