One of the Mars’ moons is getting closer and closer to the rocky planet and could create a ring around the Red Planet, according to a new study. Phobos, biggest moon of Mars, has been towards the Red Planet.

Presently, our solar system has four gas giants with rings: Saturn, Jupiter, Neptune and Uranus. The study published in the journal Nature Geoscience stated that in about 40 million years, the solar system will have five planets with rings. As per study authors, it will be the last time when a rocky planet will have a ring.

When a moonlet is in its orbit around its host planet, it may have three destinies. If a moon is at an accurate distance from a planet, it will remain in orbit. If it is far from its host, it will go away. If a moonlet is too close to its host, it will come closer and closer and crashes into host.

Scientists have found that Phobos is getting about 1.8cm closer to the Red Planet every year. It means in about 20 to 70 million years, the moonlet will start touching the edge Martian atmosphere. The ripped moonlet will form a ring that will last for many years. According to the researchers, the ring could be of a similar density to that of Saturn’s.