Exploring the Earth and the Cosmos by Isaac Asimov

Author:Isaac Asimov [Asimov, Isaac]
Language: eng
Format: epub, pdf
ISBN: 9780517546673
Google: UZjvAAAAMAAJ
Amazon: 0713915714
Goodreads: 1408092
Published: 2022-02-10T07:47:10+00:00

1955) advanced his Special Theory of Relativity, according to which it is impossible for anything to travel faster than the speed of light in a vacuum. The Special Theory has been checked innumerable times in the eight decades since it was advanced, in innumerable ways, by innumerable people, and it has held fast and firm. No physicist expects to see the speed of light surpassed.

If this is so, that means the fastest any spaceship will ever travel will be 299,792.5 kilometers per second, and at that rate, it will take’

4.3 years to reach the nearest star, 30,000 years to reach the center of our galaxy, 300,000 years to circumnavigate it, 2,300,000 years to reach the Andromeda galaxy, 1,000,000,000 years to reach the nearest quasar, 10,000,000,000 years to reach the farthest quasar we have detected, and perhaps 40,000,000,000 years to circumnavigate the universe.

In short, the speed of light, which is unimaginably fast by earthly standards, is an impossibly slow crawl in terms of the universe as a whole, and we are condemned to crawl just that slowly, or more slowly still. Anything but a few neighbor stars is really out o f reach even if we are prepared to spend a lifetime traveling.

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