Astronomy

Astronomy is the scientific study of the Universe. Astronomers use telescopes to help them study the stars, the structure of the universe and other objects.

Optical Telescopes

Optical telescopes use either lenses or mirrors to make distant objects look bigger and brighter. Telescopes can be based on earth or in space. Telescopes are often built on mountain tops where the thin, clear air and dark skies give the best views.

Black Holes

Two types of black holes are known to exist. Stellar-mass black holes form when a very massive star (at least 25 times heavier than our Sun) runs out of nuclear fuel. The star explodes as a supernova and what remains is a black hole, usually only a few times heavier than our Sun since the explosion has blown much of the stellar material away. We know less about the birth of supermassive black holes, which are much heavier than stellar-mass black holes and live in the centers of galaxies. Using high energy X-rays to see through the massive clouds that surround them, NuSTAR will provide a first ever census of supermassive black holes throughout space and time.

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