The mysterious Oort cloud is the source of many of our solar system's comets, but astronomers still have no idea what it ...

Did you know our solar system might have had an extra planet? Scientists believe a mysterious ninth planet once existed but ...

Planet demographics reveal a puzzling lack of worlds in a certain size range throughout the galaxy F or centuries our solar ...

In February 2025, all seven of our planetary neighbors will be visible from Earth. So what does such a planetary alignment ...

Astronomers for the first time have deciphered the three-dimensional structure of the atmosphere of a planet beyond our solar ...

That path is called the ecliptic, and it exists because all planets in our solar system orbit around the sun on roughly the same plane. You may like Watch 'planetary parade' online for free on Jan ...

That path is called the ecliptic, and it exists because all planets in our solar system orbit around the sun on roughly the same plane. Astronomers, on the other hand, look for more specific ...

Sure, they’re particles and rocks, but they’re still a fascinatingly long way from home. Alpha Centauri is the star system ...

But turning our nine-planet solar system into eight just earned Pluto more fans. This year also marks the 10th anniversary of Pluto's first dedicated flyby mission. NASA’s New Horizons spacecraft ...

Feb. 18 marks the 95th anniversary of the discovery of our outermost planet-not-planet. Here's what to know about the short ...

Saturn, Venus, Neptune, Uranus, Jupiter, Mars and Mercury will be visible in an uncommon planetary alignment this month.

Jan. 15, 2025 — New observational data and simulation models have confirmed a new type of planet ... could reshape our understanding of the Earth-Moon system and the broader solar system.