
Messier 51, as observed in the Sloan Digital Sky Survey, is actually two galaxies in collision. The impact, which will take 100 million years to complete, creates the spiral arms and the spray of stars visible at the right. Known as the Whirlpool Galaxy, Messier 51 is 23 million light-years away from Earth.
After decades of exciting breakthroughs, Princeton astronomers are enjoying a new explosion of discoveries
By W. Barksdale Maynard ’88
One breezy December afternoon in 1882, faculty astronomer Charles Young fired up gas engine that powered Halsted Observatory’s metal dome and turned dials of new, 30-foot-long telescope, fourth-largest in world. Then he waited nervously for a celestial event that would not happen again for 122 years, transit of Venus —...
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