It seems 2025 will have a strong start, too, with a planet parade just a few weeks into the new year. A planet parade is when ...

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

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

Encountering Neptune in 1989, NASA’s Voyager mission completed humankind’s first close-up exploration of the four giant outer ...

For billions of years, it's kept our ... solar system. The solar system is approximately 4.6 billion years old. Astronomers believe that roughly 100 million years into its existence, the planets ...

Encountering Neptune in 1989, NASA's Voyager mission completed humankind's first close-up exploration of the four giant outer ...

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

However, planets may not be necessary for ... between 1 and 5 astronomical units in the solar system," they write. "To ...

For two decades now, the iconic twin Voyager spacecraft have been quietly overturning everything we thought we knew about the boundary between our solar system and interstellar space ...