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Ranking of the top ten most habitable planets

Gliese 581d (English, German: Gliese 581d) is an exoplanet, orbiting the red dwarf Gliese 581 in Libra, about 20.5 light-years away from the earth. In July 2014, Paul Robertson, an astronomer at Pennsylvania State University, said in an article published in science that among the 10 "super earths" that scientists previously thought were most likely to have life, Gliese 581g and Gliese 581d were not even planets.

10、Tau Ceti f

Gliese 832C is a planet orbiting the star Gliese 832, with an orbit cycle of 36 days. Its mass is about five times that of the earth. Habitability this may be the closest extrasolar planet to earth's conditions ever found. Astronomers believe that it is likely to have a similar earth temperature, similar seasonality, and the orbital environment also allows the existence of liquid water.

9. Gliese 581d

Gliese 581d (English, German: Gliese 581d) is an exoplanet, orbiting the red dwarf Gliese 581 in Libra, about 20.5 light-years away from the earth. Livability in July 2014, astronomer Paul middot of Pennsylvania State University; In an article published in science, Robertson said that among the 10 'super earths' that scientists previously thought were most likely to have life, Gliese 581g and Gliese 581d were not even planets[ 1] In March 2015, British scholars said that with the help of more accurate research methods, it has been confirmed that 'Gliese 581d' does exist.

8. Gliese 163c

Gliese 163 is an M-type red dwarf star with a smaller mass than the sun. At least two planets revolve around it. GI 163c the planet revolves around Gliese 163.

7、Tau Ceti e

Introduction t planet E in Cetus is. T-STAR E in Cetus is not only an important goal for future astronomers to find extraterrestrial life, but also one of the goals of human interstellar travel in the future.

6、HD85512b

Astronomers have discovered a new extrasolar earth like planet called 'hd85512b', about 36 light-years away from the earth. Habitability according to a new study, if it has enough cloud coverage, the planet will be one of the closest exoplanets to Earth found so far. The study points out that if hd85512b has 50% cloud coverage, there may be liquid water and life.

5、HD40307g

Introduction astronomers recently found that there is an exoplanet hd40307g around a close star, which is at a moderate distance from the star and may have a suitable environment for life. The star is about 42 light-years away from the earth, and an exoplanet orbiting it happens to be in its' habitable zone '. The so-called habitable zone means that due to the moderate distance from the star, the temperature conditions on the planet's surface can allow water to exist in liquid form. Graham & middot; Guillem Angla Escude is from the University of Gottingen in Germany. She and Miko & middot from the University of Hertfordshire; Dr. Mikko tuomi is the lead author of the paper on this discovery. "This star, HD 40307, is a quiet old dwarf, so there is no reason to think that the planet orbiting it cannot have a climate similar to that of the earth," she said After habitability and the discovery of the three planets, the number of confirmed planets in the planetary system orbiting star HD 4030 has increased to six. The newly discovered planet in the habitable zone has attracted the most attention among all six planets, and its orbit is also the outermost. The planet's mass is at least seven times that of the earth, but it orbits at a distance equivalent to the distance from the earth to the sun, which means that the amount of light and heat it receives should also be similar to the amount of light the earth receives. This increases the possibility of having a livable environment.

4. Kepler-22b

Kepler-22b is the first exoplanet in the habitable zone confirmed by NASA Kepler in December 2011. It revolves around a star very similar to the sun.

3. Gliese 667cc

Gliese 667 (also known as HR 6426 or MLO 4) is a three star system in the constellation Scorpius, about 6.97 seconds away from the earth (22.7 light-years). In addition to three mutually gravitationally constrained star systems, habitability also includes a fourth optical close member (apparent magnitude 12). This fourth member has no gravitational constraints with the above three star systems, but the four stars seem to be a dark star with apparent magnitude of 5.89. The system has a relatively high operating speed of more than 1 arcsec per year.

2. Gliese 581g

Gliese 581g (Gliese 581g) is an exoplanet, orbiting the red dwarf Gliese 581 in Libra, about 20.5 light-years away from the earth. It is the sixth planet found in the Gliese 581 planetary system. It was discovered by the Carnegie society in Washington and the University of California Santa Cruz (UCSC) on September 29, 2010. It is the result of 11 years of observation by the Keck Observatory in Hawaii. Habitability the newly discovered planet in the 'habitable zone' may be the extrasolar planet most similar to the Earth found so far, and it is also the conclusive evidence of the first potentially habitable planet. However, some astronomers pointed out that there is no credible signal of any planet in the habitable area of Gliese 581, which can not confirm the existence of Gliese 581g. British astronomers based on harps observation data believe that Gliese 581 is the most suitable for the existence of five planets, and Gliese 581g does not exist. According to the research of high-resolution fly eye detector (hires) in the United States, the probability error of Gliese 581 having six planets is 99.9978%.

1. Kepler-186f

Kepler 186f (English: kepler-186f) is an extrasolar planet orbiting the red dwarf Kepler 186, about 492 light-years away from the earth. The planet is the first exoplanet with a radius similar to that of the earth in the habitable zone found next to a star outside the sun. Habitability NASA's Kepler space telescope detected kepler-186f and four other exoplanets closer to the parent star and with a radius slightly larger than the earth. Astronomers spent three years analyzing the data to find the signal of kepler-186f. They initially reported the discovery at the seminar on March 19, 2014, and some details were reported in the media at that time. The papers on the relevant findings were published in the journal Science and made fully public to the public on April 17 of the same year.