Last spring aerospace agencyNASA, using a SpaceX rocket, launched the new TESS space telescope. The task of the device is to search for potentially suitable planets outside the solar system (such planets are called exoplanets), similar in their characteristics to our Earth and located not far from us. By space standards, of course. An international team of astronomers working with this device announced the discovery by the new telescope of the first earth-like planet that meets these requirements.
Where is the planet like Earth?
Discovered exoplanet called GJ357d, located in the system of the star GJ 357, which is in the constellation Hydra about 31 light-years from Earth. Recall that the light year in astronomy is called the distance that light can go in one earthly year - about 10 trillion kilometers. The planet was discovered by the so-called transit search method. Scientists observed a change in the luminosity level of the star, which told the researchers about the presence of the planet.
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Astronomers attribute discovered exoplanet to socalled the super-earthl class. These are planets, which by their size and mass exceed our Earth, but at the same time they are significantly inferior in terms of these parameters to gas giants. According to scientists, its mass is about six times the Earth's. However, the researchers say that they have not yet established its exact dimensions and composition. If it turns out to be rocky, that is, the same as our Earth, then its size should be about twice the size of the earth. Around its star, the planet makes one complete revolution in 56 earthly days.
Is life possible on other planets?
According to researchers, the discovered planetrotates around a red dwarf star class. These stars are much smaller in size and mass than our Sun and much dimmer than our star. But it is in these stars, they believe, scientists should look for life in other systems.
Star class is not the only factor raisingchances of the possibility of life on the discovered world. The thing is that the exoplanet GJ 357d is also located in the so-called habitable zone of its star - the region of space, where it is not too hot and at the same time not too cold for the water on the surface of the planets to remain in liquid form. Scientists do not yet know whether there is water on the discovered planet, but in the future this will allow installing more powerful telescopes that are about to be launched into space in the near future.
According to scientists, the average temperature on the planetGJ 357d can be around -50 degrees Celsius. Conditions, almost like on Mars. How can life exist there? According to recent studies, even on such cold planets there may be suitable places suitable for the survival of living organisms.
Schematic of the GJ 357 planetary system
Astronomers report that GJ 357d is not the onlyplanet in its system. The TESS telescope also detected two other exoplanets. The object, called GJ 357b, is about 22 percent larger than our Earth and is 11 times closer to its star than the planet Mercury is to the Sun. Because of this, according to scientists, the temperature on the surface of this planet is 254 degrees Celsius.
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Another planet of the system is GJ 357s. It is located about 2 times from its star GJ 357b. According to scientists, the temperature on its surface is 127 degrees. Such conditions on these two planets, of course, reject the possibility of life on them.
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