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Almost all known black holes come in two sizes: small and gigantic.

Spitzer Space Telescope—and turned them into sound. Hear what some galaxies and stars sound like

A full moon starts the month, Jupiter and Saturn will be early birds and night owls, and while Venus and Mars go low in the west,

Keep your eyes on the sky throughout August. You'll see Saturn at dusk and dawn, the Perseid meteors return, and you may even catch a "super blue moon," so-called when there are two full moons in a month.

We know the Moon has water, so could future astronauts access and make use of it?

Do robots help human in spece?

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