Scientists have measured the expansion rate of the universe


26/03/2011

It is equal to 73.8 km / sec. / Mpc. So, what does this number?

In 1998, scientists discovered that the universe is not only expanding, but does it with ever-increasing speed. Using a particular type of computing brightness of stars and supernovae, they were able to calculate the exact value of the acceleration of the universe, which is as it grows. Naturally, this is very, very fast. We present our brief explanation of their discovery.

Since the rate at which the universe is expanding?

The universe is expanding at a rate of 73.8 kilometers per second per 3.26 million light-years, plus or minus 2.4 kilometers, according to a study published in the Astrophysical Journal.

How to explain this?

Expansion of space means that the galaxies are moving away from us. The further they go, the faster moving. According to this equation, the galaxy, which is located at a distance of 3.26 million light-years away - or at a distance of one Mpc - is removed at a rate of 73.8 kilometers per second. Galaxy, at a distance of two Mpc is removed twice as fast, and so forth.

What does this tell us?

"This is yet another proof that the universe is expanding," - said Phil Plate from the magazine Discover. Some have theorized that we observe evidence of expansion - just an illusion due to the location of our galaxy in a giant void. But the unprecedented precision of the measurement data, allowed to reject the so-called "theory of emptiness." Now all the power can be directed to the study of what causes the universe to expand.

Scientists think that the expansion of the universe?

Dark energy. This name scientists have given that mysterious force that makes the universe expand, rather than contract under the influence of gravitational attraction. To understand this "uncharted and elusive repulsive force" - a cherished goal of astrophysicists.

Original: Theweek


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