Q:

What is the definition of "black hole"?

A:

A black hole as an invisible spot in space where gravity is so intense that nothing can escape it. Even light is trapped by this celestial body. Black holes can form when a star has died and collapsed in on itself, becoming incredibly dense.

Black holes are hard to detect, but special telescopes in space are able to detect them by studying the movement of stars and gas around them. Scientists believe the Milky Way galaxy may be home to numerous black holes, and the size of black holes can range from the size of an atom to more than 1 million times the size of the sun.

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    What are black holes made of?

    A:

    A black hole is not, strictly, made of anything in the conventional sense. Black holes are so exotic that they defy commonsense ideas about matter. While an object such as Earth can be described in terms of its atoms and molecules, the unchecked gravity of a black hole shreds atoms until what remains is describable only as a quantum singularity.

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  • Q:

    How does gravity work?

    A:

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    What is the equation for specific gravity?

    A:

    Specific gravity, also known as relative density, is the ratio of the weight of a substance to the weight of an equal volume of water at a temperature of 4 degrees Celsius. The weight value in the equation can be substituted with the density of that substance.

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    How does gravity keep us on Earth?

    A:

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