If Brown’s hidden world is real, Rubin will almost certainly find it or strong indirect evidence that it exists. “In the ...

The odd atmosphere of a fledgling exoplanet is causing astronomers to question leading theories of how planets form.

As 2025 begins, you can easily spot four planets in the evening sky. Venus, Saturn, Jupiter and Mars all shine brightly every ...

The Sun is an incandescent but benevolent dictator. For billions of years, it's kept our Solar System well organized and ...

Astronomers posed over the past decade that dark comets, or objects that resemble asteroids but move like comets, may exist.

Dark comets are comets that are so small, fast and/or chemically rare that they are difficult to see from Earth ...

Test your knowledge on our solar system, from the biggest and smallest planets to the behemoth mountain on Mars.

and sustaining temperature gradients of 25–100 K and pressure differences of 10 kPa against the vacuum of space can allow ...

It's possible for our solar system to capture a rogue planet and give it a home as it hurtles through the galaxy, according ...

If Saturn's rings are older, they are also easier to explain. The Solar System was much more chaotic billions of years ago, ...

The Parker Solar Probe is expected to pass within an "unprecedented" 3.86 million miles of the solar surface on Dec. 24, according to NASA. "It's about to be on its closest approach to the sun," Rayl ...

The evolution of the orbits of the planets is a complex process. Initially the planets formed out of a rotating disk of gas ...