Pluto

A grassroots movement seeks to build momentum for a second NASA mission to the outer solar system, a generation after a similar effort helped give rise to the first one.

Since NASA's Cassini spacecraft has ended its epic 13-year stint at Saturn, here's a look at some other missions en route to new destinations or slated to launch in the next few years.

Pluto's surface hosts blades of ice that soar to the height of skyscrapers — and researchers have narrowed down exactly how the dramatic features form.

NASA's New Horizons spacecraft is zooming through the outer solar system with its eyes open once again.

Guitarist Tommy Shaw of the legendary rock band Styx dedicates a song to Saturn's Cassini spacecraft in a new video.

NASA's New Horizons spacecraft will get three times closer to its next flyby target than it got to Pluto back in July 2015, if all goes according to plan.

NASA's New Horizons spacecraft may double its pleasure during its next deep-space flyby 16 months from now.

On the two-year anniversary of the New Horizons probe's flyby of Pluto, mission scientists unveiled two detailed global maps of the dwarf planet and its largest moon, Charon.

You can relive New Horizons' epic Pluto flyby, thanks to two amazing videos NASA released Friday (July 14), the two-year anniversary of the landmark event.

On July 14, 2015, NASA's New Horizons spacecraft zoomed within 7,800 miles (12,550 kilometers) of Pluto, capturing the first-ever up-close looks at the dwarf planet system.

The frigid, faraway body that NASA's New Horizons spacecraft will zoom by 18 months from now may actually be a cluster of small objects, new observations suggest.

The team behind the New Horizons mission to Pluto recently pulled of a challenging observation of the spacecraft's next target, MU69, as the object eclipsed a distant star.

If you could go anywhere in the Solar System, where would it be?

Fusion-powered rockets that are only the size of a few refrigerators could one day help propel spacecraft at high speeds to nearby planets or even other stars, a NASA-funded spaceflight company says.

New Horizons team members have traveled to Argentina and South Africa to watch the Kuiper Belt object 2014 MU69 — the mission's next flyby target — pass in front of a distant star.

The dwarf planet 2007 OR10, informally known as "Snow White," has a moon that's between 150 miles and 250 miles (240 to 400 kilometers) wide, a new study reveals.