Astronomers analyzed sampletable exoplanets in our galaxy and concluded that about a quarter of them may have ocean beneath the surface. You can confirm this by bude in the future, if we can observe the traces of water in the atmosphere of these celestial bodies. Article researchers published in the journal Publications of the Astronomical Society of the Pacific.

To find a possible ocean worlds, a team of researchers from the center of Goddard NASA has selected 53 extrasolar planets about the size of the Earth. Their weight thus could be up to eight times larger than the earth. Scientists suggest that planets of this size should be rocky, and likely to have liquid water on its surface or under it.

After this scientists tried to determine how much energy each of these elements to allocate in the form of heat. For this, the authors considered two main sources of heat. First of radiogenic heat, which is created over billions of years due to the slow raspadom radioactive materials in the mantle and crust of the planet. The speed of this decay depends on the age of the planet and the mass of her robes. Other scientists have determined these ratios for planets the size of Earth. Now astronomers have calculated this figure for its list of 53 planets, assuming that their ages equal to the age of the parent star and mantle of the planet takes the same percentage amount that the Earth’s mantle.

The researchers then calculated the heat which may be created by other sources. For example, the tidal force generated by the gravitational attraction. Planets with elongated or elliptical orbits there is a constant offset from the parent star. This leads to a change of the gravitational attraction between two objects and force the planet to stretch, causing its core heats up. Eventually, the heat reaches the surface. and heats it.

One of the ways by which heat can reach the surface a volcano or a cryovolcano. The other way is associated with the movement of tectonic plates — geological process responsible for the movement of the outermost of the rocky or ice layer of the planet or moon. No matter how heat is generated, it is important to know what amount of it allocates the planet. This figure is important to calculate the habitability of exoplanets. For example, too much volcanic activity may turn the habitable world literally to hell. But too little activity can stop the release of gases that form the atmosphere and then the planet will become too cold. Only the optimum amount of heat can sustain life on a planet with water, like Earth, or, possibly, a habitable moon, such as Europe.

In the next decade, the spacecraft NASA’s Europa Clipper will explore the surface and depths of Europe and will transmit to Earth information about what is beneath its surface. The more scientists can learn about Europe and the other potentially habitable moons of our Solar system, the better they will be able to understand similar worlds around other stars that can revive our galaxy, according to new research.