Phobos and Deimos, the moons of Mars, could be pieces ripped away from the planet. Credit: NASA/JPL-Caltech/Malin Space Science Systems/Texas A&M Univ.
The two moons of Mars could be pieces of the planet itself - space science news headlines

A new study about the origin of the two Martian moons contradicts previous long-lasting theories claiming that Phobos and Deimos, were asteroids captured in Mars’ gravitational pull.

According to the new research study, the moons are made up of pieces of planet Mars itself. Most likely they were blasted off of Mars at some point in the history of the planet.

The conclusion was based on comparing the spectral properties of the Tagish Lake meteorite (coming from the asteroid belt) with those of the Martian moons. This hypothesis is similar to the current theories about the origin of the Earth’s moon.

Read the full story: University of Alberta
Scientific publication: Journal of Geophysical Research