Today, and on July 10 and 17, astronomers will be watching as tiny MU69 in the outer solar system - the New Horizons spacecraft's next target - occults or blocks the light from 3 different stars.
Albert Einstein hypothesized these ripples in the fabric of space-time a century ago. Now scientists have detected them for the 3rd time, from distant black hole collisions.
A unique and beautiful poster-sized calendar. Keep up with all phases of the moon every night of the year. Only about 100 left in stock, get them while you can!
Venus passed 1.8 degrees south of Uranus yesterday, and Eliot Herman in Tucson captured their close conjunction. Click here to view larger, to see just a hint of Uranus' green color.
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