When you look at the night sky, do you ever wonder what's going on out there? On a clear night with a dark sky, if moonlight doesn't wash it out, sometimes you can see the arc of the Milky Way. The ...
The United States Naval Observatory (USNO) has released the Fourth Edition of its USNO CCD Astrograph Catalog (UCAC4), the most precise and comprehensive star catalog ever produced by ground-based ...
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