Why is Kepler 452b called Another Earth

Kepler 452b, a newly discovered outer planet by NASA, is twice the diameter of the Earth and the Earth Similarity Index (ESI), located in the constellation Cygnus, 1,400 light-years from the Earth.

This is the first "habitable" planet discovered so far in 2015 that revolves around a star of the same type as the Sun and is about the size of the Earth.

At 0:00 on July 24, 2015, NASA held a **** meeting and announced that they had discovered a terrestrial planet Kepler-452b in the constellation Cygnus, which has a similarity index with the Earth. Located 1,400 light-years from Earth, this terrestrial planet orbits a star that closely resembles the Sun.

Kepler 452b is the same distance from the Earth to the Sun. NASA said that due to a lack of critical data, it is now impossible to say whether Kepler-452b is "another Earth" or not, only that it is "the closest exoplanet to another Earth to date."

In the NASA statement, Kepler 452b did not refer to "another Earth" or "Earth", but only called it a landmark discovery on the road to "another Earth". In other words, Kepler 452b just brings us one step closer to the search for the "Earth," and at the same time means that Kepler 452b itself is not Earth.

Why is Kepler-452b said to be another Earth? Star Awareness Project

There are no living beings on planet Kepler 452b.

Kepler 452b, a newly discovered outer planet by NASA, is twice the diameter of the Earth and the Earth Similarity Index (ESI), located in the constellation Cygnus, 1,400 light-years from the Earth. It is the first "habitable" planet discovered so far in 2015 that revolves around a star of the same type as the Sun and is similar in size to Earth.

It is known that the planet Kepler-452b was discovered by the Kepler Space Telescope. During the four-year mission, the Kepler telescope kept an eye on a small area of the sky near the constellation Cygnus. The newly discovered planet, located in Kepler's field of view, belongs to the constellation Cygnus.

Cygnus is one of the northern celestial constellations. Cygnus is completely immersed in the white expanse of the Milky Way, standing alongside the constellations Aquila and Lyra, the three main stars of these three constellations form a large triangle (the Great Triangle of Summer). There are 191 stars with visual magnitude 6 in the constellation, including 22 stars with magnitude 4.

Therefore, in the summer night sky, although the Milky Way is like a light veil and full of stars, it is not difficult to find Cygnus, and its appearance can still be distinguished in the Milky Way.

Kepler 452b is about 1402 light-years away from Earth.

Kepler-452b is an exoplanet orbiting Kepler-452, a G-type main-sequence star in the constellation Cygnus, about 1,402 light-years (430 parsecs) from Earth. It was observed by the Kepler Space Telescope, and the National Aeronautics and Space Administration (NASA) announced its discovery on July 23, 2015.

Kepler 452b is the first potential super-Earth rocky planet discovered, orbiting within the habitable zone of a sun-like star. According to its physical properties, it is sometimes referred to as the Earth or the cousin of the Earth.

Kepler 452b is nearly 1,400 light-years (430 parsec) from Earth, and the fastest spacecraft is the New Horizons probe Mammoth, which flew by Pluto in July 2015 at only 56,628 kilometers per hour, and if it were to fly to Kepler 452b, it would take about 25.8 million years to arrive.

Kepler 452b physical properties are known or

Kepler-452b may have five times the mass of the Earth, and its surface gravity is almost twice that of the Earth, thanks to the fact that the mass calculations of exoplanets are only a rough estimate. If it is a terrestrial planet, it could be a super-Earth with many active volcanoes due to its higher mass and density. From a space perspective, most of its surface will be shrouded in dense and foggy clouds.

However, it has a mass of 5 times the mass of the Earth, which also increases the likelihood that the planet is a mini-Neptune rather than a super-Earth. The planet has an orbital period of 385 Earth days, a radius 50 times larger than the Earth's, and is located within the traditional habitable zone of its parent star, with a thermal equilibrium temperature of 265 K (8°C), which is somewhat warmer than the Earth.

But because Kepler 452 has a lifespan of about 6.5 billion years, 2 billion years longer than Earth, it is possible for the rocky planet's water and atmosphere to evaporate, resulting in an estimated surface temperature of 393 K (120 °C; 248°f）。

The above content refers to Encyclopedia-Kepler 452b

We all know that the earth has a lifespan. Moreover, with the development of science and technology, people's pollution of the environment is becoming more and more serious. There are also many sciences that predict the end of the world, such as Albert Einstein, who predicted that humanity will perish in 2036.

Now, there are many people who hope for Second Earth, hoping to find a planet similar to Earth where humans can live.

Second Earth Kepler 452b

At present, NASA has discovered a new outer planet, named Kepler 452b. Kepler 452b has the title of Second Earth I because of its similarity to Earth is more than 80%. It is undoubtedly surprising to be able to find a planet very similar to Earth in the limited lifespan of Earth, however, there are many problems that cannot be solved now.

First of all, this is Puller 452b, a planet called the Second Earth, which is 1,400 light-years away. At our current rate, even after tens of millions of years, it will not be possible to reach planet Puller 452b. So, in terms of speed, we can't talk about the Puller 452b.

What's more, Puller 452b, the "cousin of the earth", although very similar to the earth, is only superficially similar.

The similarity between Kepler 452b and the Earth is as high as 80% on the second Earth is still only speculation among scientists. Because it's so far away from us, we don't know the specifics of it. Perhaps its specifics are far from speculation, it is so far away from us that even speculation about it, at least at this stage, is not confirmed at all.

In the vast universe, through the continuous exploration of scientists, we have finally discovered the planet that is most similar to our earth, and the acquaintance rate is 98 percent of our earth. The planet is Kepler-452b 60% larger than Earth in diameter and about 1,400 light-years away.

For a long time, human beings have been working hard to improve civilization, in order to one day in the future, human beings can leave the earth and go to distant interstellar space-time, and because of the rapid development of human beings, the earth will gradually become a planet that is not suitable for life and human beings continue to develop a high degree of civilization, obviously human beings can only solve this problem by finding more terrestrial planets!

Although the current technology of human beings is not yet able to take human beings away from the earth, but it is believed that with the development speed of human civilization, it will not take long in the future, for the contrary, scientists have screened out many terrestrial planets, the most noteworthy of which must be the Kepler 452b planet that is regarded as the earth's own brother, because this planet is also in the habitable zone of its main star, because it contains oxygen and liquid water, so it is regarded as at least more than 90% similar to the earth!

The reason why the data of Kepler 452b discovered this time has aroused great interest in the academic community and the public is precisely because its "three-dimensional" indicators are too similar to the earth: its orbiting stars belong to the G class like the sun, which are 1.5 billion years older than the sun and are in the stable prime of life; It is 60% larger than the Earth; The revolution period is 385 days.

Kepler's next mission was official back in 2017: to find habitable planets around stars near us. It would take nine years for humans to reach Pluto, which had just been revealed a few days ago, and more than 500 million years to reach Kepler 452b.

The universe is vast, there are too many unsolved mysteries, too many planets similar to the earth for us to explore, perhaps one day human beings can break through the limits of life and stay away from birth, old age, sickness and death. Maybe find another space to survive. Maybe one day our deceased relatives will meet in another world.

Is it the only planet in the universe where life exists? Of course not, there are hundreds of billions of galaxies in the entire universe, and the number of stars and planets is even more numerous, in the case of the Milky Way, it is a huge galaxy with a diameter of about 120,000 light years, and there are 200 billion 400 billion stars in it, and there are even more planets.

Therefore, the earth is not the only planet in the universe where life exists, and although life cannot exist universally in the universe, it can never exist only on the earth. And those planets where life may exist outside of Earth are called super-Earths by scientists.

SuperEarths, also known as superterrestrial planets, typically have canyons, craters, and volcanoes on their surfaces. In general, super-Earths are judged only by their mass, and conditions such as temperature, composition, orbital parameters, habitability, or planetary environment are not included. Their upper limit is generally considered to be 10 Earth masses and the lower limit is 1.5 times the Earth's mass.

Today we are going to talk about such a super-Earth, which is the cousin of the Earth - Kepler-452b (Kepler-452 B).

Kepler-452b is a planet located 1,402 light-years from Earth, orbiting a star called Kepler-452. It was discovered on July 23, 2015 by NASA's Kepler Space Telescope.

Why is Kepler-452B the cousin of Earth? This is because Kepler-452b is too similar to the Earth, its orbital semi-major axis is an astronomical unit, while the Earth's orbital semi-major axis is 1 astronomical unit, not only that, Kepler-452b takes days to revolve around Kepler-452, while the Earth takes 365 days, 5 hours, 48 minutes and 46 seconds to revolve around the sun.

A large part of the reason why the Earth can have life is that the distance between the Earth and the Sun is just right, and the region where the Earth is currently located is the habitable zone of the solar system, and Kepler-452b is also in the habitable zone of the Kepler-452 galaxy.

Is there any life on the continent of Kepler-452b? Since Kepler-452 is 6.5 billion years old, it is 1.9 billion years older than the Sun. During its stellar evolution, Kepler-452b receives 10 more energy from Kepler-452 than Earth receives from the Sun.

So if Kepler-452b were a terrestrial planet, it would probably suffer a runaway greenhouse effect similar to that of Venus. However, since Kepler-452b is 160% the volume of the Earth, it may have a mass of 5m (the mass of the Earth), which allows it to have oceans for a longer period of time, about 500 million years. Conversely, due to the increase in volcanic activity at Puller-452b, the carbonate-silicate cycle is "buffered" to extend its lifetime.

For all these reasons, it is possible that life could survive on the surface of Kepler-452b for an additional 590 million years before Kepler-452b was pushed out of the habitable zone of its galaxy.