Two more planets have been discovered by the same group of international scientists near the solar system.
And there is the possibility of another third planet near those two planets.
Both planets are orbiting closely - outside the living space by the name GJ887 - a small star located 11 years away from sunlight.
The proximity between the two planets and the stars is greater than the proximity between Mercury and the sun.
The two planets, whose existence has been confirmed, have been described as the 'great earth'.
They are 4 to 7 times larger than the earth, but they are similar to Uranus and Neptune.
"They are also said to have a solid foundation," said Sandra Jeffers of the University of Gottingen and the study's leader, speaking to the BBC.
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These planets are believed to have a heavier environment compared to our planet.
The study was carried out by the Red Dots project, and was designed by various universities around the world to find planets that are similar to the earth and closer to the solar system and the results were published in a scientific journal.
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'High Capacity Cameras'
Both planets, dubbed GJ 887b and GJ 887c, were discovered using a high-resolution European Southern Observatory (ESO) spacecraft located in La Silla, Chile.
IMAGE SOURCE, ESO / M. KORNMESSER
Photo caption,
The planets make faster and shorter cycles compared to Mercury, which takes 88 days on earth to complete one cycle.
According to observations, the two planets are located near their star.
The farthest one from the star, GJ 887c, takes approximately 21.8 days of earth's orbit to make one orbit 9.9 GJ 887b takes about 9.3 days of earth to complete one orbit in the sun.
These cycles are faster and shorter than the planet Mercury, which takes 88 days to complete one cycle in the sun.
Astronomers have already discovered other planets located near the solar system, such as the Proxima Centauri and the Wolf 359, located at 4.2 and 7.9 light-years away. But they are not as close as the GJ887.
So the planet GJ887 is the closest. But the GJ887 is the closest, according to the Andalusia Institute of Aerospace Physics (IAA-CSIC.).
"These planetary systems are widely found in other stars - between 15 and 30 percent of the solar-type star - but we have never seen one that is so close to the sun," said Guillem Anglada-Escudé, from the ICE Institute. -CSIC) from the University of Barcelona and one of the founders of the study.
'The best star'
The two planets are located near the living area near the stars.
That is the area in which the planets of a particular system may have an environment that allows for life
IMAGE SOURCE, GETTY IMAGES
Photo caption,
The black dwarf Mercury takes about 88 days to make one orbit in the sun
But outside the region, scientists believe that GJ 887b and GJ 887c can be so hot that water cannot remain in its natural state.
Both global temperatures are estimated to be between 70º and 200ºC, according to the existing astronomical research institute catalonia.
However, researchers in the project say that a star by the name of GJ 887 does not have any function, a step that is preferred by the surrounding planetary environment.
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If the GJ 887 "were as vibrant as the Sun, it is likely that strong winds would sweep the planet's atmosphere," according to Göttingen University in a statement released Thursday.
But the absence of such winds means that "newly discovered planets may remain with their atmosphere, or have a heavier environment than Earth, and potentially life-sustaining, despite receiving more light than Earth," he adds.
"The newly discovered planets are more likely to see if they have an environment and to study them in detail. By studying them, scientists will be able to understand whether such ecosystems are suitable for life," Jeffers also told BBC World.
The third planet?
Scientists have discovered signs of a possible third planet, the largest of the first two in the GJ 887 system.
That third planet will be among the living things.
IMAGE SOURCE, AFP / GETTY IMAGES
Photo caption,
Scientists have discovered signs of a possible third planet, the largest of the first two in the GJ 887 system.
Dr. John Barnes, a research specialist at the Open University in the UK and one of the authors of the study, told the PA news agency that "if the signal comes from a planet, it will have a 51-day cycle".
"However, we see signs with a similar pattern that we know must come from the stars. That is why we cannot say that the third sign is a planet.
Melvyn Davies, a professor of astronomy at Lund University in Sweden, who was not involved in the study, wrote in the journal Science, that "if another study confirms the existence of a third planet in the living space, then GJ 887 could be one of the most widely studied planetary systems in the vicinity of the sun. "