Mars’ moons, Phobos and Deimos, have long puzzled scientists with their small, irregular shapes. A new study published in the journal Icarus suggests that these moons may actually be the remnants of a doomed asteroid that got too close to the Red Planet.
The traditional theories of how the moons formed include the idea that they were captured asteroids or that they formed from debris of a giant impact, similar to how our own moon was formed. However, these theories do not fully explain the moons’ peculiar features, such as their circular, stable orbits around Mars’ equator.
To address this mystery, planetary scientist Jacob Kegerreis and his team at NASA’s Ames Research Center proposed a new hypothesis. They suggest that Mars did capture an asteroid, but the planet’s gravity tore the rock apart, forming a short-lived ring around Mars. From this ring, the potato-shaped moons could have formed with their circular orbits already established.
To test their hypothesis, the researchers conducted hundreds of computer simulations of asteroids on a collision course with Mars. They found that under various conditions, rings of debris could form around the planet, supporting their theory.
An upcoming mission by the Japanese space agency, Mars Moons Exploration, scheduled to launch in 2026, aims to collect samples from Phobos and bring them back to Earth. The composition of these samples could provide valuable insights into the origins of the moons. If the samples are similar to Mars, it would support the giant impact hypothesis. However, if they contain more asteroid-like characteristics or volatile compounds, it would lend credibility to the shredded asteroid hypothesis.
Studying Mars’ moons not only helps unravel the mysteries of our solar system but also provides valuable insights into the formation of moons around exoplanets. Kegerreis believes that understanding how moons form in different solar systems can help in the exploration of exoplanets and exomoons.
In conclusion, the new hypothesis proposed by Kegerreis and his team offers a fresh perspective on the origins of Mars’ moons. By combining computer simulations with upcoming space missions, scientists hope to unlock the secrets of these enigmatic celestial bodies and shed light on the formation of moons in our own solar system and beyond.
