Rover Captures Sunset in Blue Martian Sky
PASADENA, Calif. - The Opportunity rover turned its panoramic gaze on the horizon and captured a dusty blue sunset at the end of its 20th day on Mars.
The six-wheeled robot snapped photographs not for the sake of beauty, but because scientists want to learn about the properties of dust in the atmosphere.
"It's pretty cool," pancam lead scientist Jim Bell said Thursday at NASA (news - web sites)'s Jet Propulsion Library as he showed a movie made from images recorded about three minutes apart.
A bluish tint and rapid dimming of the sun at the horizon were caused by dust scattering the sunlight, just as smog might do on Earth.
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Rover Captures Sunset in Blue Martian Sky