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

According to a recent YouGov poll, 35% of Americans think Pluto is not a planet. But they are all wrong—kind of. To get to ...

Most of the information we have about planets beyond our solar system (exoplanets ... looked at a range of wavelengths of light, including in the optical region where effects of stellar ...

The organic ingredients to life, hints to where Earth’s water came from, and the fundamental building blocks of our planet ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

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

However, this year a powerful new telescope is coming online that could prove once and for all that there really is a ninth planet in our Solar System. The same year that Pluto was ignominiously ...

All of our solar system’s planets are lining up to ... apparent than during a planetary alignment. An alignment including all of the planets except Mercury is taking place in mid-January.

Eight billion miles (14 billion kilometers) from Earth, at the solar system’s ragged ... astronomers had hotly debated Pluto’s planethood. Our then-ninth planet was smaller than any other ...

2025 is starting off with a bang for skygazers, with a planet parade now visible in the night sky. A planet parade is when several of our solar system's planets are visible in the night sky at the ...

This provides another piece of the puzzle to understand how planets and ... Pluto-Charon ... that could reshape our understanding of the Earth-Moon system and the broader solar system.