Some questions about the universe.

According to the geography textbook of senior one, it is 65.438+0 billion.

From 65438 to 0995, astronomers used the Hubble Space Telescope to observe the northern outer space. It is estimated that there are about 80 billion galaxies in the universe. Three years later, in June, 1998, 10, southern outer space was observed again, and it was estimated that the number of galaxies in the universe reached 125 billion.

Why are there such big differences between the two observations? Harry Ferguson of the American Space Telescope Science Institute explained that this is because the observation distance in southern space is farther than that in northern space.

Therefore, there are more galaxies in the universe than 654.38+025 billion, because the Hubble Space Telescope didn't see the edge of the universe.

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The size of a galaxy is not measured by the number of stars, but by its mass or range.

1990101On October 30th, American astronomers observed a galaxy about 60 times the size of the Milky Way, 6 million light years away. This is the largest galaxy ever discovered.

According to the American magazine Science, this galaxy is located in the center of a cluster of galaxies and is called "ABELL)2029. It * * * has 100000 billion stars, while the Milky Way has only 200 billion stars.

Minimum mass

According to the website of Science Daily, American scientists have recently discovered the universe. According to the website of Science Daily, American scientists have discovered the smallest galaxy in the universe, and its mass is about 10 billion times that of the sun.

Recently, an astronomy professor at the University of California, Irvine, successfully discovered the smallest galaxy in the universe by observing the light emitted by galaxies. The mass of this galaxy is about100000 times that of the sun, and it belongs to a white dwarf galaxy. Scientists say that, to be exact, we have found a white dwarf galaxy cluster, which consists of dozens of smaller galaxies. Although the appearance size and brightness of these galaxies are different, or even different greatly, the mass of these galaxies is surprisingly consistent, each of which is100000 times that of the sun. The mass of the Milky Way is about 6.5438+million times that of the sun.

Minimum range

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These galaxies were once listed as new ultra-dense dwarfs-UCD. The mass of these galaxies is lighter than ordinary dwarf galaxies by 1 ~ 2, and their size can be completely placed between the solar system and Orion, that is, their diameter is about 500 light years. Most likely, these small galaxies were formed by ordinary dwarf galaxies, and the peripheral stars of dwarf galaxies captured the neighboring larger galaxies.

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It's hard to say how many.

A new study says that there may be at least hundreds of billions of planets in the Milky Way alone, which is far beyond people's initial understanding.

According to a report published by researchers in the new issue of the British journal Nature, this means that there is at least one planet around each star in the Milky Way. So planets around stars should actually be a common phenomenon, not a rare phenomenon that people thought in the past.

There are about 200 billion stars in the Milky Way.