There are retrogrades that simply slow us down, and then there are retrogrades that ask us to stop, feel, and re-evaluate ...

Sedna will make its closest approach to the Sun in 2076, giving us a rare opportunity to visit the planetoid before it drifts ...

Imagine waking up one morning to the news: a black hole is drifting close to our solar system. It sounds like the plot of a .

“This is a big step in understanding the outer solar system,” said Dr. Rosemary Pike, lead researcher from the Center for Astrophysics | Harvard & Smithsonian. “It shows that even very distant regions ...

Stars often whip their planets with solar winds and radiation, pull them ever closer with gravity and sear them with heat.

No telescope has basked in the night sky quite like the enormous new Vera Rubin Observatory. Here's what it could reveal ...

Learn how a new discovery of a giant planet can help scientists refine their theories of how planets form.

In the outer reaches of our solar system, far beyond the orbit of Pluto, lies Sedna, one of the most mysterious objects ever ...

Neptune is called an “ice giant” because it’s mostly made of a thick, slushy mix of water, methane, and ammonia, which ...

With the release of its first images this month, the Vera C. Rubin Observatory has begun a 10-year mission to help unravel ...

How long does it take Pluto to orbit the sun? Learn more about how this planet makes one lap around our Solar System.