One summer night in 1877, American astronomer Asaph Hall was looking through his telescope in Washington, D.C. Mars was at its closest point to Earth in its orbit, and Hall had one question on his ...

Earth isn't the only planet experiencing spectacular solar eclipses as moons pass in front of our solar system's sun. Two months before a total solar eclipse is expected to shroud a long swath of ...

Phobos is the larger and innermost of Mars' two moons, and it's a fascinating celestial body. It's small, irregularly shaped, and orbiting just about 6,000 kilometers above the surface of the Red ...

The conventional wisdom about Mars’ small and misshapen moons, Phobos and Deimos, is that they were either created like Earth’s Moon — carved out of the planet by an impact with a huge object — or ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. As Phobos, one of ...

Experts speculate a new Phobos mission could launch by 2030, leveraging advancements in propulsion and AI for safer trajectories. The Phobos-Grunt mission, Russia’s endeavor to explore Mars' moon ...

Mars itself is a world of puzzlement, particularly when it comes to whether or not the planet is the home of ancient or even present-day life. But put that aside for the moment. Even without the ...

Robotic Martians can see blue Earth in Mars' sky. The Curiosity rover, a car-sized NASA robot looking to find evidence of past habitability on the Red Planet, recently snapped an image of Mars' ...

Previously unpublished photos of Mars' moon Phobos hint that the mysterious satellite may actually be a trapped comet — or perhaps just a piece of one, along with its twin moon Deimos. When you ...

Six planets in the solar system have at least one moon. Both Earth and Mars are toward the lower end of the lunar count, as our home planet only has one moon, and Mars has two. But not all moons share ...

The long, shallow grooves lining the surface of Phobos are likely early signs of the structural failure that will ultimately destroy this moon of Mars. Orbiting a mere 3,700 miles (6,000 kilometers) ...