One summer night in 1877, American astronomer Asaph Hall was looking through his telescope in Washington, D.C. Mars was at ...

The solar system has many more moons than the one we can see in the sky. ... Venus does have one known quasi-moon, ... Mars' ...

Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to ...

How big it is: 865,000 miles (1.392 million kilometers) across How far away it is: 93 million miles (150 million km) What ...

Mars appears low in our western sky for an hour or two after sunset.  Spotting it will be made easier if binoculars are used.

Our solar system is made up of the sun and all the amazing objects that travel around it. Learn more about the planets, asteroids, and comets in our solar system. 3:55 ...

Passing stars could trigger instability across the solar system, resulting in Earth being hauled out of its orbit.

Researchers in the US have suggested there is a 40 percent chance a ninth planet could exist in our solar system. Planet Nine ...

President Donald Trump’s fiscal 2026 budget request, if approved by Congress, would kill many of NASA’s plans for robotic ...

Stars passing close to the sun could cause planets to collide, including with Earth, or even be ejected as rogue planets, new ...

Faculty and alumni from across six decades reflected on Brown University’s impact as an international hub for solar system ...