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 .

We measure the extremely long distances between things in space by light years. A light year is the distance that light travels in one Earth year. Light travels at about 300,000 kilometres per second.

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

“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 ...

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

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

The solar wind pushes some of the gas and dust away from the comet, forming those beautiful tails we see. A comet actually ...

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

In the frozen outskirts of the solar system, a reddish dwarf planet orbits in silence. Known as Sedna, it is so distant that ...

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

A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in our solar system.

However, at Neptune’s surface, the gravity is only about 1.1 times the gravity we experience on Earth. In other words, if ...