Every day is almost day after day, Hua Feng doesn't know if what he does is really meaningful, but sometimes he has to go ahead and don't ask about the return. If he was allowed to choose again, he didn't know if he would refuse to change at that point and just be an ordinary soldier, but there was no if.

The discovery of life on other planets is not the same as the discovery of aliens, but even the discovery of a single-celled bacterium on an alien planet would shake the idea of the uniqueness of life on Earth. However, there are still many questions about this planet that remain unanswered. Scientists have not yet been able to confirm whether there is water on it or what its atmospheric composition is, but because its environment is perfect for the existence of liquid water, and because there seems to be life where there is water on Earth, Justin believes that "there is a 100% chance of life on this planet".

Relatively speaking, the discovery of this planet has not taken long and is not difficult, and astronomers believe that there are millions more such terrestrial planets waiting to be explored. The discovery of Gliese 581g was based on the Hawaiian W. The results of 11 years of observations at the M. Keck Observatory, the combination of modern advanced science and technology with traditional terrestrial telescopes continue to play an important role in exoplanet exploration.

In early May 2011, an international team of astronomers from MIT, Columbia University, Harvard, and Santa Cruz in California officially announced the discovery: Pandora.

The planet number is: 55 Ca

c

ie, surrounded by the number 55 CA

c

The star of i A orbits in just 18 hours. That is, to live on the planet, you don't need a calendar at all, just remember to bring a watch. And the sun seen is 60 times larger and 3,600 times brighter than what is seen on Earth.

The planet's surface temperature is 2,700 degrees Celsius, and astronomers at MIT believe that there is no possibility of an atmospheric structure at such a high temperature, but some scientists believe that gravity is strong enough to retain part of the atmosphere. Because of the high brightness of the host star, many of the more sensitive measurements can be made, making the planet a perfect laboratory for scientists to study the formation and evolution of the planet and its entire life cycle.

However, the planet cannot be directly observed, even with powerful telescopes. And the stars in this planetary system, i.e. 55 Ca

c

i A, in the next two months, if on a good night, it can be observed by the naked eye.

by 55 CA

c

The first planet was discovered in 1997 by a team of researchers in California and named 55 Ca

c

i b。 In the five years that followed, the team discovered two more planets, 55 Ca

c

ic and 55 Ca

c

By 2004, a Texas team had discovered 55 CA

c

ie, discovered in 2008, is also the fifth planet of the planetary system: -55 Ca

c

i f。

The discovery of these five planets is based on the Doppler technique, in which the stars wobble due to the gravitational pull of nearby planets, and the parameters of the planets are determined by measuring changes in the wavelength of the starlight.

Rebekah, a Ph.D. candidate in astronomy at Harvard, and Da, an extradepartmental astronomy expert at the University of California, Santa Cruz

IE, re-analyzed the 2004 data, considering 55 Ca

c

The orbital period of i e was smaller than originally thought, and then the Wi of MIT

and Matt Holma of the Smithsonian Astrophysics Center

Astronomers applied for the MOST space telescope to make observations and found that the transit period was only 17 hours and 41 minutes, which is in line with the former analysis, while the star's light dimmed by only 1/5000 of the light during each transit, and these data also concluded that the planet is about 210,000 kilometers in diameter, about 60% larger than the Earth.

Professor Matthews, an astronomer at Columbia University, was excited about the discovery: like Ki in Star Trek

Captain K did the same thing, and we (science) will eventually catch up with science fiction. Kepler-22b is the first exoplanet confirmed by NASA in the habitable zone in December 2011. It orbits around a star that closely resembles the Sun. NASA has confirmed that the planet Kepler-22b is habitable for humans.

On February 2, 2012, an international team of researchers announced the discovery of a "super-Earth" outside the solar system, potentially suitable for life.

Astronomers discovered the "super-Earth" while studying a dwarf star 22 light-years away, numbered GJ667C. It has at least 4.5 times the mass of the Earth, orbits a dwarf star with a period of 28.15 days. The dwarf star GJ667C itself is a member of a three-star system, which in turn carries three planets. With the exception of this "super-Earth", numbered GJ667Cc, the other two planets are not suitable for known life.

Judging by the distance between the "super-Earth" and the dwarf star, the surface temperature of the "super-Earth" should be similar to that of the Earth, and liquid water may be present, the researchers said in a paper to be published in the next issue of the Astrophysical Journal Letters. However, more observations are needed to confirm this judgment.

"This planet is the 'best new candidate' to support liquid water and possible life," said research leader Giem Angrada-Esquard of the Carnegie Endowment for Science. On February 20, 2012, astronomers confirmed the existence of a new planet in the universe, GJ 1214b. Also known as the "super-Earth," the exoplanet's atmosphere may contain abundant water vapor or be shrouded in a thick layer of fog. Therefore, astronomers believe that different substances may exist there.

American astronomers have observed the terrestrial planet with the Harper telescope, which is only 40 light-years away from Earth and orbits a faint red dwarf. GJ 1214b is about 2.7 times the diameter of the Earth and its mass is 7 times that of the Earth. The planet is very hot, possibly reaching 230 degrees Celsius, so there may be different substances present there.

This is the first "super-Earth" exoplanet with an atmosphere discovered by mankind, and the others are gas giants. It is also estimated that 75% of the planet's surface area is covered by water vapor, so staying on it is highly likely to feel like a "sauna". But this is the hottest planet ever discovered since such observations.

Burta, a principal researcher at Harvard's Smithsonson Center for Astrophysics, said: "GJ 1214b is unlike any planet known to us. ”

In November 2012, astronomers scouring the search for potentially habitable planets for life had a new candidate: a world in a nearby galaxy the size of seven Earths.

The planet is located about 42 light-years from Earth. It was previously thought that the Tershelmet star named "HD40307" had only three planets orbiting, but it was calculated that there are three other planets in the star system using highly sensitive data filtering methods. The farthest planet is in the "sweet spot" – the distance from the star happens to allow for liquid water, and therefore life as well.

According to the British "Mirror" report on March 27, Scott Sheppa, an astronomer at the Carnegie Institution for Science in the United States

d) Discover a pink planet at the edge of the solar system and sign it under the name of Vice President of the United States (VP, Vice P

eside

t). This is a dwarf star that was named 2012 VP 113. It is 450 kilometers in diameter and is located on the edge of the solar system, further to Pluto, where scientists once thought there were no planets. This planet of pink ice and rocks orbits the sun.

This planet is the second celestial body to be discovered in a mysterious region between the solar system and outer space known as the "Neolt Nebula". Astronomers believe that there may be thousands of previously unknown objects orbiting the sun at a great distance. Scientists believe that the way the new planet orbits the Sun foreshadows the possibility of a "super-Earth" that may orbit the Sun at a distance.

On March 7, 2015, British scholars confirmed the existence of "super-Earth" as the first extra-habitable planet.

A team of scientists reported in the weekly Astronomy and Astrophysics that the four-planetary planetary system had been hidden in the M-shaped constellation Cassiopeia in the Northern Hemisphere, "only" 21 light-years from Earth.

On July 23, 2015, Kepler 452b (Keple

452b), a newly discovered exoplanet by NASA, is 1.6 times the diameter of the Earth, with an Earth Similarity Index (ESI) of 0.83, located in the constellation Cygnus, 1,400 light-years from 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 similar in size to Earth, and it is likely to have an atmosphere and flowing water, and is known as Earth 2.0, the "cousin of Earth".

The "super-Earth" that has been discovered is only the tip of the iceberg, and with the advancement of modern observation methods and the innovation of a new generation of technology, the speed of discovery of "super-Earth" will become faster and faster.

NASA's Kepler spacecraft, which carries humanity's largest telescope and has been launched into extraterrestrial orbit, may find habitable terrestrial planets for the first time. In the future, it will be possible for humans to find habitable planets that orbit around stars like the Sun. And once such a planet is discovered, interstellar migration, which often appears in science fiction, could become a reality.