Starwatch: the September night sky


The Sun is tracking southwards at its fastest for the year when it crosses the celestial equator at the autumnal equinox on the 23d. As darkness arrives earlier, the daily westwards shift of our evening…

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‘Big splat’ may explain the moon’s mountainous far side


The mountainous region on the far side of the moon, known as the lunar farside highlands, may be the solid remains of a collision with a smaller companion moon, according to a new study by…

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