Reflected glory

Messier 78 is a fine example of a reflection nebula. The ultraviolet radiation from the stars that illuminate it is not intense enough to ionise the gas to make it glow — its dust particles simply reflect the starlight that falls on them. D…

2-timing spacecraft has date with another comet

NASA’s Stardust spacecraft, equipped with the University of Chicago’s Dust Flux Monitor Instrument (DFMI), is hurtling at more than 24,000 miles an hour toward a Valentine’s Day encounter with comet Tempel 1.
Stardust will approach to within 124…

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