Planet also 'blooms'

Humans are not alone in the fight against obesity, because the size of the planets also increases temporarily in a period.

'Astronomers have just discovered that the size of many gas planets changes in stages and they cannot apply the standard theory to explain that phenomenon. For example, the actual width of Jupiter may be up to 30% larger than the estimated width , ' said Laurent Ibgui, an astronomer at Princeton University.

Gas accounts for most of Jupiter's volume.Therefore, it is classified as a giant gas planet.Photo: kidscosmos.org.

Scientists have previously assumed that, because cold air is smaller than hot gas, Jupiter (a gas planet) shrinks when it loses its initial heat. But Ibgui thinks the story is not so simple.

Jupiter, like many giant planets, is composed of gases in liquid form because of low temperatures. So this type of celestial body is usually larger than the planet with earth and rock (like the earth). The size of the giant gas planet often changes periodically. Ibgui and his colleagues created a computer simulation model to explain the phenomenon. The model shows that gas planets often have elliptical orbits. Therefore the distance between them and the individual star (in the case of Jupiter is the sun) is not fixed.

When the planetary gas approaches the star, the star's attraction causes its outer air to swell. The outermost gas collapses as it moves away from the star. The continuous relaxation of the gas that produces heat causes the gas layers inside the planet to heat up. This process causes the effect to cool down (over billions of years and cause the planetary planet to contract) to become ineffective. Then, the planet's orbit turns into a round shape over time. When the orbit becomes a circle, the cooling effect gradually reappears and the planet size will decrease.