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NASA WISE Satellite Blasts Into Space
coondoggie writes "After a three day delay, NASA's Wide-field Infrared Survey Explorer this morning blasted into space courtesy of a Delta II rocket and will soon begin bathing the cosmos with infrared light, picking up the glow of hundreds of millions of objects and producing millions of images. The space agency says the WISE spacecraft will circle Earth over the poles, scanning the entire sky one-and-a-half times in nine months. The idea behind the spacecraft is to uncover objects never seen before, including the coolest stars, the universe's most luminous galaxies and some of the darkest near-Earth asteroids and comets."
Wouldn't that scan complete one sky in 6 months? It's kind of strange to report that it will do 1.5 in 9.
It's because WISE has a limited life expentancy of 10 months. In that 10 months its expected to cover the whole sky 1.5 times.
The life expentancy is only 10 months because the instrument needs to be cooled, which is done with solid hydrogen. Once the hydrogen is gone, the primary mission is over. Not sure if they have a plan for afterwards and can get secondary uses out of it.