Exquisite Venus-Jupiter Conjunction This Weekend

I wrote about this in an earlier blog, but I just wanted to give you a reminder about Saturday’s very close conjunction of Venus and Jupiter low in the western sky shortly after sundown. Tonight, the duo will be about 1° apart, on Saturday just 0.1° (⅕ of the moon’s diameter) and on Sunday they’ll…
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Astronomers Discover ‘Ghost Galaxy’ Made Of 99.99% Dark Matter

Dark matter is infuriating. It’s everywhere, outnumbering regular matter by 5 to 1. Yet it doesn’t reveal itself to our eyes or telescopes. Dark matter gives off no light and interacts with ordinary matter in just one way — through gravity. By measuring how much it tugs on stars and galaxies, we can estimate the…
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