Explore the hypothetical existence of parallel planetary systems.

"Consider a hypothetical solar system where all the planets reside within the star's habitable zone, potentially supporting ...

A powerful new observatory is the best hope yet for finding the elusive Planet 9, a large planet that some scientists say is hidden in our solar system.

But it's the hottest planet in the solar system. But why ... The amount of carbon dioxide in Venus' atmosphere traps all the sunlight that manages to penetrate the cloud layers of Venus.

Mar. 17, 2025 — A combination of cosmic processes shapes the formation of one of the most common types of planets outside of our solar system, according to a new ... Webb Telescope Captures Its ...

Astronomers now have a powerful new tool to uncover the faintest traces of exoplanets, galactic structures, variable stars, and fleeting cosmic events beyond our solar system. The Prime-focus ...

Pluto is undoubtedly the most famous of all the dwarf planets, because it was once considered part of the main lineup of planets in our solar system. But there are… ...

Q: Why do the planets all orbit the Sun in the same plane? —Randi Eldevik | Stillwater, Oklahoma Because of the way the Sun formed, explains David DeVorkin, a senior curator in the space history ...

The NEO Surveyor fulfills a 2005 act of Congress ordering NASA to catalog 90% of near-Earth objects larger than 459 feet, which is roughly the size at which an asteroid could take out a city, or ...