New discovery! Finding a "second earth" is no longer a dream.

Astronomers discovered a solar system-like planet cluster 40 light-years away, and the search for a "second Earth" is no longer a dream.
, a major discovery has shocked the world's astronomical community.
On the morning of February 22nd, NASA held a press conference in Washington, D.C., to announce the discovery of up to seven exoplanets of Earth-like size around a small star just 40 light-years (376 trillion kilometers) from Earth, three of which have been identified as livable zones and are likely to contain liquid water.
the results of a joint study by scientists from the United States, Belgium, the United Kingdom and other countries were published in the journal Nature on the same day.
Discover new planets and increase the chances of finding extraterrestary life, according to NASA's official website, with the help of Spitzer, the agency's largest infrared space telescope to date, and several ground-based telescopes, astronomers, after three weeks of observations, have finally determined that In a solar system-like system of exoplanets called TRAPPIST-1, seven rocky planets orbit an ultra-cold dwarf star at the center of the galaxy, and the planets are so close to each other that there could theoretically be water.
discovery of the seven planets suggests that there may be more livable planets outside the solar system than previously expected, increasing the chances of finding extraterrestronity life.
the seven planets have been described by Western researchers as the "Seven Wonders".
, NASA said it was the largest system ever discovered outside the solar system orbiting a single star and a livable belt of stars.
believe that this solar system-like planet galaxies may be the best destination for the search for extraterrestary life in the Milky Way.
discovery has boiled over the entire astronomy community.
"I never expected this to happen, and that's out of my imagination," said Nicole Lewis, an astronomer at the Space Telescope Science Institute.
she can't wait to use the James Webb Space Telescope to further study the galaxy in the future.
At a press conference on the same day, NASA Deputy Director Thomas Chubixing excitedly said that the major discovery of the exoplanet system shows that "the search for a 'second Earth' is no longer a question of 'can't' but 'when'", he said, "the answer to 'are we alone in the universe' is an important scientific priority, the first time in the livable zone to find so many planets at the same time is an extraordinary step towards achieving this goal."
" look at the stars and inspire the younger generation to explore exoplanets, which are planets orbiting stars other than the sun.
The number of newly discovered planets by astronomers has increased dramatically in the last 20 years, and in May 2016 NASA's Kaipler telescope confirmed the existence of 1,284 exoplanets in one breath, about doubling the total, including nine on the livable belt of their respective star systems and about 550 rocky planets the size of Earth.
just two months after the discovery, it was announced that 104 exoplanets had been discovered, two of which were in the livable zone of their star system.
, humans have identified 3,449 exoplanets, with another 4,696 suspected targets awaiting confirmation.
the study's lead author, astronomer Michael Gillon of the University of Liege in Belgium, noted that the central star of the TRAPPIST-1 galaxy involved was classified as an M dwarf, the most common type of star in the Milky Way.
previous searches for exoplanets have focused on larger and brighter stars, which are brighter and more sun-like, and only recently did research begin to turn to M dwarfs.
team led by Geelong used the star metering method to find targets through ground-based telescopes in Chile and Morocco, respectively.
may last year, the team reported the discovery of three planets around trappist-1 central stars.
After, with the assistance of several ground-based telescopes, such as the European Southern Observatory's Oversized Telescope, Spitzer confirmed the existence of two of the planets and discovered five others, eventually bringing the total number of newly discovered planets to seven.
scientists accurately measured the size of seven planets and assessed the density of six of them.
planets are larger than Mars, about 40 to 1.4 times the diameter of Earth.
as a whole, the density of these planets may be lower than that of Earth, perhaps comparable to that of Jupiter's frozen moons.
scientists say further observations will help determine whether they contain liquid water.
the outerst of the seven planets has yet to be assessed and is thought to be a cold "snowball", although astronomers need to look further.
, another project is also trying to find signs of life in the galaxy, and some preliminary results have been obtained.
A team of researchers using the Hubble Space Telescope has found blurred atmospheric traces around the TRAPPIST-1 galaxy, and the James Webb Space Telescope, which is expected to launch in 2018, will be able to conduct detailed analysis and research on the atmospheric chemistry of these planets.
"For our generation, it may mean that it's never out of reach," said Sarah Seager, a professor of planetary science and physics at the Massachusetts Institute of Technology and one of the study's authors.
, however, we will still look at the stars, because the world where there are possibilities not only carries the infinite imagination of our generation, but also inspires the exploration enthusiasm of the younger generation, who will eventually go.
" (People's Daily Los Angeles, February 23rd, people's daily reporter in the United States Liao Zhengjun) Source: People's Daily.