How many earths are there in the universe, and how big is the earth, how big is the universe

Claim that the solar system is not unique and that there are many more planets that can be inhabited by humans In science fiction**, future humans will establish colonies on hundreds of planets in the galaxy, but are there so many habitable planets in the galaxy? Some astronomers said on the 28th that the answer is yes, because the solar system is not unique, and there are too many "earths" for human habitation in the vast universe. 236 extrasolar planets have been discovered A group of researchers said at a meeting held by the American Astronomical Society on the 28th that they discovered a total of 28 new planets orbiting other stars last year, and so far, mankind has discovered 236 extrasolar planets.

Jeffrey Marcy, a professor of astronomy at the University of California, Berkeley, who led the team, said: "We're starting to think that our Earth isn't a rarity in the universe. Marcy said

We can now easily detect large exoplanets the size of Jupiter and Saturn, and many of them are as far away from their stars as our Jupiter and Saturn are from the Sun, a ubiquitous structure in the planetary system. The researchers say the new technology has allowed them to detect smaller planets, but they have yet to find a planet of similar size to Earth. Marcy said that in the exoplanetary system, there are four that have multiple planets.

We found that many stars are not just one planet, and when we discover one of them, the second and third will come into our sight. Discovering that a new planet could have water earlier this month Marcy said they are now very excited to conclude that there could be water on a new planet discovered three years ago. The planet orbits the star Gliese 436, which has a similar mass to Neptune.

Earlier this month, when the planet passed between Gliese 436 and Earth, scientists in Switzerland and Belgium photographed Gliese 436 and deduced the planet's diameter and density from small changes in Gliese 436's light. "The density of this planet is 2 grams per cubic centimeter, which is twice that of water," Marcy said.

This means that it is made up of 50 parts rock and nearly 50 parts of water, in addition to a small amount of hydrogen and helium. We now believe that it has a hard core and is surrounded by water on the outside. This is the first time we have identified the structure of an extrasolar planet.

There are more "Earths" to be discovered by scientists Marcie believes that researchers will discover more similar structures in the future. "There are more than 200 billion stars in our Milky Way, and I estimate that 10 of them may carry habitable planets. There are trillions of galaxies in the universe, and there will be hundreds of billions of planets like Earth in each galaxy.

But our solar system also has a very unusual feature: the orbits of all the planets are almost circular. In other star systems, the orbits of the planets are mostly elliptical.

"We enjoy near-constant temperatures throughout the year, and if the Earth is too close to the Sun, the Earth will overheat and the water will evaporate," Marcy said. If you are too far away from the sun, the earth will be very cold.

Scientists estimate that there are about 30,000 Earth-like ones in the current observation area. Seen on the Internet.

It is possible that there is no Earth, and there may be an infinite number of !!.

The diameter of the Earth is 12,756 kilometers, and the diameter of a typical glass sphere is centimeters, that is, its volume is a million times. For the sake of discussion, we can roughly calculate it as a hundred million times, i.e. the diameter of the Sun is 1,392,000 kilometers, and if it is reduced according to this ratio, then its diameter is about meters.

If the earth were to be compared to a glass ball, what would the size of the world be?

We can look at it in chronological order, first of all, the solar system, generally speaking, the edge of the solar system is the Ultra Nebula, which is a spherical nebula, which envelops the entire solar system in a huge spherical nebula, its diameter is about two light years, and one light year is the year of light in the universe, that is, its diameter will reach 946 trillion kilometers.

Extremely vast. There are countless terrestrial planets in the universe, of course, earth humans are not the only intelligent creatures in the universe, or if the living environment of other terrestrial planets is more superior and much better than that of the earth, it is likely that earth humans are not worthy of being intelligent creatures, and even biased to be mentally retarded - earth humans should not be arrogant and ignorant!

Of course it's one, as for the planet universe similar to the existence of life or civilization on the earth, it must not be our earth, but it hasn't been discovered yet, aren't we humans exploring and searching?

The American Soul Brick family says that there will be no planets like Earth in the Milky Way.

The appearance of life on Earth is just a coincidence in the solar system.

The Milky Way is one of the hundreds of billions of galaxies in the universe, and there is no way for mankind to know how much of the universe there is.