I wonder, which planets may be suitable for human habitation?

Kepler -22b is the first exoplanet located in the livable zone confirmed by NASA in February, 201/. It revolves around a star very similar to the sun. NASA confirmed that Kepler -22b planet is suitable for human habitation.

catalogue

Discover a planet

Introduction to planets

Immigration conjecture

Its "sun": slightly smaller and slightly colder.

Three conditions for a livable planet

Guide to livable planets

Discover a planet

Introduction to planets

Immigration conjecture

Its "sun": slightly smaller and slightly colder.

Three conditions for a livable planet

Guide to livable planets

launch

Edit this paragraph to discover planets.

Kepler mission of NASA confirmed the first of the so-called "Yi" in 20112.

Comparison of Kepler -22b planetary system and planets of the solar system.

An exoplanet in the habitable zone, orbiting a star very similar to our sun. The newly confirmed exoplanet is named -22b (Kepler -22b. As of February 2 0 1 1, scientists reported that 54 exoplanet candidates had been discovered in the livable zone, of which Kepler -22b was the first one to be confirmed.

William? Brouqui is a scientist at the Ames Research Center of NASA in California and the chief scientist of the Kepler telescope project. He led the discovery of Kepler -22b. He said: "The first time we observed the possible sporadic clues of this exoplanet, it was only three days after the completion of the telescope's launch and debugging work, and we finally observed the repeated Ling Xing phenomenon three times during the holiday of 20 10, so we can confirm this discovery."

Edit the introduction of this planet.

Kepler -22b is about 2.4 times the diameter of the earth and about 600 light years away. Using the existing spacecraft, it will take 22 million years for human beings to fly to Kepler -22b. Although its diameter is much larger than that of the earth, its orbital period is about 290 days, which is not much different from that of the earth. The central star it surrounds is very similar to the sun, and it is also a yellow dwarf with spectral type G, but its mass is slightly smaller. The surface temperature of this planet is about 70 degrees Fahrenheit (equivalent to 2 1 celsius), which is very suitable for living.

However, scientists are not sure whether the earth's surface is rock, liquid or gas. However, this discovery has taken a solid step towards the ultimate goal of finding another earth. [ 1]

Composition and structure

So far, its exact quality and surface composition are still unknown. If its density is equivalent to that of the earth (5.5 15 g/cm), its mass may be 13.8 (2.4) times that of the earth [calc 1], and its surface gravity is 2.4 times that of the earth [calc 2]. If its density is equivalent to liquid water (1 g/cm), its mass is 2.5 times that of the earth [calc 3] and its surface gravity is 0.43 times that of the earth [calc 4]. This planet may be classified as a super earth, but it depends on its actual mass.

Initially, it was estimated that the mass of this planet may reach 35 times that of the Earth, which is similar to Neptune's gas giant planet, but the most likely situation is that it is an ocean planet, and its mass is 10 times that of the Earth.

According to its actual mass, the planet may be super earth or "warm Neptune".

Edit this immigration conjecture

However, it is unrealistic to emigrate immediately, because Kepler-22b is located in the direction of Lyra and Cygnus, about 600 light years away from the earth. Previously, scientists have discovered many planets in the "livable zone", but unfortunately, most of them are huge gas planets, which are not suitable for life. Kepler-22b is not much bigger than the Earth, which means it is likely to be made of rocks, but scientists have not confirmed whether the planet is mainly made of rocks or gases or liquids. This is the planet that has proved to be the closest to the shape of the earth in size and orbit.

Edit this paragraph as its "sun": slightly smaller and slightly colder.

The parent star around this planet is slightly smaller and colder than the sun, but it belongs to a relatively stable and long-lived star like the sun. Douglas, a scientist on the Kepler project at NASA headquarters, said that the discovery of Kepler -22b was "an important milestone in the process of discovering our twin brothers on earth". Related research results will be published in the American journal Astrophysics.

Edit three conditions for a livable planet in this paragraph.

1 liquid water: water is the source of all life. Since life is inseparable from water, the essence of finding extraterrestrial life is to find liquid water.

2 Life span: Life takes a long time to be born, so if there is life in a galaxy, the life span of its central star should not be too short. It is generally believed that the life span of the central star must reach at least 10 billion years before it can breed life in its planetary system.

3 "Bodyguard": The number of giant gaseous planets in the planetary system is also an important condition. In our solar system, Jupiter and Saturn are giant gas planets with huge mass, which actually act as the "bodyguards" of the earth. Like baseball gloves, they resist the invasion of comets on the earth and can deflect or attract comets that may collide with the earth.

Edit this livable planet guide.

According to British media reports on the 6th, scientists have begun to make a systematic "guide to livable planets" to classify the planets found so far that are suitable for future human migration. It is reported that the 47 planets and satellites discovered by humans may meet the conditions of human migration.

The Livable Planet Laboratory of the University of Puerto Rico analyzed the types of more than 700 planets known to human beings and their respective solar systems, and found that most of them did not have the conditions for life, and only 47 of them entered the "Second Earth" candidate list. It is reported that many planets that have been discovered belong to gas giants such as Jupiter and Neptune, but they are too close to their parent stars to provide climate conditions like the earth. Only a few planets have sizes and orbits suitable for life.

The guide uses innovative evaluation criteria, such as earth index, livable zone distance, classification system and comparison results with the past and present situation of the earth. The analysis results show that only two known planets meet the livability level of the guide, namely, the planets with code names Grace 58 1d and HD 855 12b, and other 15 planets and 30 satellites are on the shortlist.

Like Allen, the scientist who discovered the planet Kepler -22b? Persia said: "The discovery of Kepler -22b proves that people on earth are not alone, and the universe may be full of all kinds of life."

Mars has always been the first choice for human beings to have life. There has been a legend of "Martians" since ancient times. It is the future migration place of mankind. In addition, Europa and Titan may be suitable for human habitation.