A look at the compositions of terrestrial planets, gas giants, and ice giants in our Solar System.

The worlds of our Solar System run the gamut of temperatures. Here are some of the hottest and coldest places we know of.

The latest news on missions to search for ice and water beneath planetary surfaces.

On a ranch in the Texas hill country, members of The Planetary Society gathered to marvel at the 2024 total solar eclipse as a community.

Space science costs money. Here's why it's worth the investment.

For hundreds of millions of people, the Sun and Moon put on an astonishing show this week. Here are our eclipse highlights and more.

From spotting comets to hearing eclipses and predicting solar emissions, there are many ways to experience space phenomena.

NASA and the European Space Agency (ESA) have a long-standing partnership that has resulted in spectacular science missions, including the James Webb Space Telescope and the Cassini-Huygens mission to Saturn.

New technologies, projects, and resources aim to help people with blindness and low vision experience the eclipse.

Planet X and Planet Nine are planets that have, at one time or another, been thought to exist in our Solar System. Both were theorized to explain orbital characteristics of smaller outer Solar System bodies.

Measuring changes in the Moon’s size, watching for eruptions on the Sun’s surface, and monitoring budget developments.

As the Sun nears solar maximum, the odds of potentially dangerous solar storms go up. What could one do to Earth?

Federal spending caps and inflation take a bite out of NASA's ambitions.

The Moon is shrinking in both actual volume and its apparent size from Earth’s perspective. We explain how scientists know this, why it happens, and how it might affect Earth.

Jupiter has much more going on beneath its outer clouds, and NASA invites players to unravel a fictional mystery.

China's Queqiao-2 spacecraft will relay communications to Earth to support lunar far side and south pole missions, including missions led by international partners.

Funding for the Near-Earth Object Surveyor, support for VERITAS, and a second lease on life for Mars Sample Return were all included in the final congressional budget for NASA in 2024.

There are hundreds of eclipse events being held all across North America. Here's how to find one near you.

A moon transiting the Sun is awesome, but still doesn’t quite compare to a total solar eclipse. Learn why, find out about Europa Clipper’s message in a bottle, and more.

Twenty years ago, a Planetary Society program sent students to NASA's Jet Propulsion Laboratory to work on the Mars Exploration Rovers program.