Trappist-1

NASA discovers 7 potentially habitable planets

NASA has just revealed a great scientific discovery by discovering 7 rocky planets, located just 40 light years away, these rocky planets initially relatively temperate and some can be habitable.

As expected in a previous statement, “NASA will make a mysterious revelation on Wednesday“. NASA today announced the discovery, with its Spitzer Space Telescope, of a system of 7 rocky planets orbiting a dwarf planet. It is a whole system that revolves around a single small star, Trappist-1, about forty light years away in the direction of the constellation of Aquarius. Moreover, the identified planets have characteristics close to those of the earth.

About Trappist-1

The star Trappist-1 is a red dwarf, whose mass is 8% of that of our Sun, and whose size is scarcely greater than that of Jupiter. Around this small star there are at least seven planets, identified by letters, from Trappist-1b to Trappist-1h, in order of distance from the star and according to the conventions in force which want the name of the star to be followed by a tiny letter attributed to the planet. These planets are very close, between 20 and 90 times closer to their star than the Earth is to the Sun.

They turn very fast around the red dwarf. The researchers were able to determine the orbital period (duration of the year) of six of them. They range from 1.51 days to 12.35 days. The seventh has not yet been sufficiently observed for this data to be determined.

The researchers were able to calculate the size and mass of these planets. Of the seven, five have sizes similar to that of the Earth (planets b, c, e, f and g), while the other two lie between Earth and Mars. They are indeed rocky planets, therefore of the same type as the Earth, Venus, Mars or Mercury .

Planets where we can live

Is  there a twin of the Earth in the lot? Probably not. Although it is exciting to make some comparisons, the Trappist-1 and solar system situations are very different.

First, Trappist-1 is a red dwarf, stars known for violent solar flares at certain times in their lives. Such eruptions could literally sterilize a planet.

Then, the proximity of the seven planets with their star makes it probable that they are in synchronous rotation, thus always presenting the same face to their sun. A permanent day hemisphere, an eternal hemisphere of night and a twilight zone in between, although this does not entirely exclude the possibility of a relatively temperate atmosphere and climate, it must create conditions that we can not Than to attempt to imagine.

Finally, we must take into account an effect that is known in particular on the moons of Jupiter or Saturn: tidal forces, linked to gravity. Proximity with the central body (planet or star) can create internal frictions and heat the satellites: this is how oceans of liquid water could exist under the surfaces of Europe or Enceladus, despite their distance from the Sun. In the case of Trappist-1, we do not yet know how these forces could affect the general equilibrium of the climate of these planets.

Source: L’OBS

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