Does our Solar System have 9 planets or only 8? Astronomers have gone back and forth on that a lot, with Pluto now being classified as a dwarf planet. However, out beyond Neptune there could be ...

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Mars, Venus, Jupiter and Saturn should be visible to the naked eye, but with a telescope you can spot Neptune and Uranus.

Scientists believe that two asteroids might be fragments of long-lost "planetary embryos" from the early solar system.

Astronomers may have discovered a scrawny star bolting through the middle of our galaxy with a planet in tow. If confirmed, ...

Baker said that there are other astronomical events that may be more interesting than the parade of planets. Baker said Mars ...

It is not often that all the planets in the Solar System other than ours are lined up across the night sky for us to see.

The formation of our solar system from a singular nebula raises an intriguing question: why did each planet develop with a ...

New research shows that star activity can distort exoplanet measurements, affecting size, temperature, and atmosphere ...

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.

This provides another piece of the puzzle to understand how planets and ... New studies offer a clearer picture of how the outer solar system formed and evolved based on analyses of trans ...