Download Black Holes (Lucent Library of Science and Technology) by Don Nardo PDF

By Don Nardo

The is still of collapsed stars, black holes own huge, immense gravities that pull in and annihilate any subject that strays too shut. the newest proof and theories for those strange items are provided during this exciting publication, together with how black holes have been first anticipated, how they shape, their actual homes, and the way scientists notice them. additionally lined are the large black holes referred to now to lurk on the facilities of such a lot galaxies and the potential for utilizing those items as cosmic gateways.

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Extra info for Black Holes (Lucent Library of Science and Technology)

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In theory, people could stoke such a black hole furnace by firing asteroids and other space debris toward the hole, destroying the debris and thereby generating energy. If people could find a way to capture that energy, say by installing large collection grids around the hole, Earth could be provided with seemingly unlimited power. On an even grander scale, given further technological advances, people might actually be able to create black holes from scratch. As John Taylor explains, this would yield mass-to-energy conversions considerably higher than 30 percent: 51 52 Black Holes Hawking Radiation and Evaporating Black Holes In 1974, English physicist Stephen Hawking surprised the scientific community by showing that black holes can give off radiation and thereby lose some of their mass.

It would be . . ”16 But as everyone can easily see and feel, the Sun is not a cold body. Stars like the Sun produce enormous amounts of energy, accounting for the second major force at work within them. The nuclear reactions taking place in a star’s core release immense amounts of heat, light, and tiny particles that travel outward toward the surface. In the Sun, for example, each and every second the core produces the same amount of energy as 100 million nuclear bombs exploding simultaneously.

Properties are all you can ever measure. There is no way to tell what the matter that went into the hole was before it was swallowed up . . whether it was a star, a great glob of water, or a pile of frozen TV dinners. 22 40 Properties and Potential Uses of Black Holes 41 Still, even if black holes “have no hair,” they do behave in certain definite and characteristic ways as they interact with the universe around them. By observing this behavior, scientists can theorize and draw conclusions about those properties of black holes that cannot be seen or measured directly.

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