The Kepler mission has seen thousands of exoplanets since 2014, with 30 planets less than twice the size of the Earth and now known in the inhabited zones of their stars.
The Kepler telescope, launched from Cape Canaveral on March 7, 2009, has helped in the search for planets outside the solar system.
On September 25, 2018 it caught its last image and five days later the fuel ran out.
When it was launched, it weighed 1,020 kg (2,020 lbs) and is 15.4 feet long by 8.9 feet wide (4.7 m × 2.7 m).
The satellite usually looks at & # 39; earth-like & # 39; planets, which means that they are rocky orbits within the orbit of a star's habitable or & # 39; Goldilocks & # 39; zone.
In total, Kepler has found around 5000 unconfirmed & # 39; candidate & # 39; exoplanets, with another 2500 & # 39; confirmed & # 39; exoplanets that scientists have proven to be real.
Kepler is currently working on the & # 39; K2 & # 39; mission to discover more exoplanets.
K2 is the spacecraft's second mission and was necessarily implemented by desire because two reaction wheels on the spacecraft failed.
These wheels control the direction and height of the spacecraft and help direct it in the right direction.
The modified mission looks at exoplanets around dim red dwarf stars.
While the planet has found thousands of exoplanets during its eight-year mission, five have been released.
Kepler-452b, named & # 39; Earth 2.0 & # 39 ;, has many features with our planet, despite being 1,400 light years away. It was found by NASA's Kepler telescope in 2014
1) & # 39; Earth 2.0 & # 39;
In 2014, the telescope made one of his greatest discoveries when he saw exoplanet Kepler-452b, named & # 39; Earth 2.0 & # 39 ;.
The object shares many characteristics with our planet despite being 1,400 light years away.
It has a orbit of a similar size as the earth, receives approximately the same amount of sunlight and has the same length of the year.
Experts still don't know for sure if the planet is home to life, but suppose that if plants are transferred there, they are likely to survive.
2) Found the first planet to spin two stars
Kepler found a planet in orbit around two stars in 2011, known as a binary star system.
The system, known as Kepler-16b, is around 200 light-years from the earth.
Experts compared the system with the famous & # 39; double sunset & # 39; on the home planet Tatooine by Luke Skywalker in & # 39; Star Wars: A New Hope & # 39 ;.
3) Find the first habitable planet outside the solar system
Scientists found Kepler-22b in 2011, the first habitable planet found by astronomers outside the solar system.
The habitable super-earth appears to be a large, rocky planet with a surface temperature of approximately 72 ° F (22 ° C), comparable to a spring day on Earth.
4) A & # 39; super-earth & # 39; to discover
The telescope found its first & # 39; super-earth & # 39; in April 2017, a huge planet called LHS 1140b.
It is about a red dwarf star at about 40 million light-years away, and scientists think it contains gigantic oceans of magma.
5) Finding the & # 39; Trappist-1 & # 39; star system
The Trappist-1 star system, which houses a record of seven earth-like planets, was one of the greatest discoveries of 2017.
Each of the planets, which orbit around a dwarf star for only 39 million light years, is likely to retain water on the surface.
Three of the planets have such good conditions that scientists say that life has already evolved on them.
Kepler saw the system in 2016, but scientists revealed the discovery in a series of articles that were released in February this year.
Kepler is a telescope with an incredibly sensitive instrument known as a photometer that detects the slightest changes in the light of stars
How does Kepler discover planets?
The telescope has an incredibly sensitive instrument known as a photometer that detects the slightest changes in the light of stars.
It simultaneously traces 100,000 stars, looking for revealing drops in light intensity that indicate an orbit planet that passes between the satellite and the distant target.
When a planet passes in front of a star from Earth, the event becomes a & # 39; pass & # 39; called.
Small decreases in the brightness of a star during transit can help scientists determine the orbit and size of the planet, as well as the size of the star.
Based on these calculations, scientists can determine whether the planet is in the & # 39; habitable zone & # 39; of the star and therefore whether it can grow the conditions for extraterrestrial life.
Kepler was the first spacecraft to inspect the planets in our own galaxy, and over the years the observations confirmed the existence of more than 2,600 exoplanets – many of which may have been the most important targets in the search for extraterrestrial life
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