In February last year, scientists announced the discovery of seven terrestrial planets running around the dim dwarf star - "Trappist-1". So far, this has not only been the star system that found the largest number of planets in the same type, but also three of which are operating in the star's livable belt. Now a new study shows that some planets inhabitable in the planetary system may exist in support of extraterrestrial water. Using an observational data from the NASA Hubble Telescope, an international team estimated that the heat and ultraviolet radiation from the central star over the past eight billion years might affect the water volume of these planets.
About 40 light-years away, TRAPPIST-1, a red dwarf star is inspiring more research enthusiasm among scientists, and now they are making greater efforts to learn more about this extrasolar planet system. Scientists' models show that the planet closest to Trappist-1 may have changed from a watery world to a hotter area, losing more than twenty times as much water as the Earth's oceans. According to the model, planets in so-called "livable zones" may lose even less water. And, billions of years later, their surface and interior may have residual moisture.
The TRAPPIST-1 has a surface temperature of about 2500 Kelvin, about 8% of the mass of the sun, 11% of the sun's radius, and has at least 500 million years of life, with trillions of years remaining to come. Our solar has the life of about 4.6 billion years, and about 5 billion years later, it will evolve into a red giant with the surface temperature of about 5778 Kelvin. Seven planets are likely to be tidally locked, that is, just as the moon is locked by the Earth. Just like our planet Earth, the seven planets are always facing the main star by the same side. The TRAPPIST-1h orbit, about 9.3 million kilometers from the central star, is about 6% of the Earth's day-distance. Although this distance is too close to the solar system, it provides a moderate surface temperature here - minus 104 Celsius (169 Kelvin) because the luminosity of its central star is only one in two-thousandth of our sun. Therefore, the surface of TRAPPIST-1h is likely to be a frozen world.
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