RIODOCE

An exoplanet 500 light-years away, the Kepler-186f, became the first planet known to be the size of the Earth outside the solar system that orbits around a star in the habitable zone . This means that it is the appropriate distance from its host star for the liquid water to accumulate on the surface.

The Georgia Tech study used simulations to analyze and identify the dynamics of the axis of rotation of the exoplanet. These dynamics determine how much a planet is inclined on its axis and how this inclination angle evolves with time. Axial inclination contributes to the seasons and climate because it affects the way sunlight hits the planet's surface, reports Millenium.

The researchers suggest that the axial tilt of Kepler-186f is very stable, just like the Earth, which makes it likely to have regular seasonal variations and a stable climate. What is the importance of axial inclination for climate? The great variability of the axial tilt could be a key reason why Mars has been transformed from a wet landscape billions of years ago to a barren desert.

The orientation angle of the orbit of a planet around its star The host can oscillate by gravitational interaction with other planets in the same system . If the orbit oscillated at the same speed as the precession of the axis of rotation of the planet, the axis of rotation would also wobble, sometimes dramatically.

Mars and Earth interact strongly with each other, as well as with Mercury and Venus. As a result, by themselves, their axes of rotation precede with the same speed as the orbital oscillation, which can cause large variations in their axial inclination.

Fortunately, the Moon keeps Earth's variations under control. The moon increases the rate of precession of the axis of rotation of our planet and makes it different from the orbital oscillation rate. Mars, on the other hand, has no satellite large enough to stabilize its axial inclination.

"It seems that the two exoplanets are very different from Mars and Earth because they have a weaker connection with their sister planets." , member of the Faculty of Physics. "We do not know if they have moons, but our calculations show that, even without satellites, Kepler-186f's axis of rotation and that of its neighbor, Kepler 62f, would have remained constant for dozens of years. millions of years. "

Kepler-186f has less than 10% of radius than the Earth, but its mass, composition and density remain a mystery. Orbit his star every 130 days.

According to NASA, the brightness of this star at noon, while it is in 186f, would look as bright as the sun just before the sun sets here on Earth. Kepler-186f is located in the constellation Cygnus as part of a star system of five planets

Kepler-62f was the closest exoplanet to the Earth up to this day. that scientists find Kepler 186f. It is about 40% larger than our planet and is likely to be a terrestrial or oceanic world.

It is in the constellation Lyra and is the outermost planet among the five exoplanets that revolve around a single star.