Kuiper Belt

The wonders – and mysteries – of Kuiper Belt object 2014 MU69 continue to multiply as NASA's New Horizons spacecraft beams home new images.

Data from NASA's New Horizons spacecraft, which explored Kuiper Belt object Ultima Thule earlier this week, is yielding scientific discoveries daily.

NASA's New Horizons spacecraft flew past Ultima Thule in the early hours of New Year's Day, ushering in the era of exploration from the enigmatic Kuiper Belt.

A schedule of events surrounding the New Horizons flyby of Kuiper Belt Object MU69.

A message from Thomas Zurbuchen, the associate administrator of NASA's Science Missions Directorate, to Alan Stern, New Horizons principal investigator of the Southwest Research Institute in Boulder, Colorado.

Closest approach takes place in the early morning hours of New Year's Day—12:33 a.m. EST—marking the most distant close exploration of worlds ever completed by humankind.

Without Hubble's intriguing early images, there might have never been a mission to explore Pluto and the Kuiper Belt.

From its brightness and size, New Horizons team members have calculated Ultima's reflectivity, which is only about 10 percent, or about as dark as garden dirt. Beyond that, nothing else is known about it.

With no apparent hazards in its way, NASA's New Horizons spacecraft has been given a "go" to stay on its optimal path as it speeds closer to a Jan. 1 flyby of a Kuiper Belt object a billion miles beyond Pluto.

It's vast and mysterious, cold and dark. It's a place we've only just begun to explore. Here are 10 things to know about the Kuiper Belt.

On New Year's Day 2019, NASA's New Horizons will fly by a distant Kuiper Belt Object—and open a new chapter in how we define our place in the cosmos.

Here’s a lineup of the various kinds of small bodies that orbit the Sun and sometimes impact planets and each other.

NASA will host a live Science Chat at 2 p.m. EST Wednesday, Nov. 7, to discuss upcoming encounters of two of the agency’s planetary missions, New Horizons and OSIRIS-REx.

Small worlds witnessed dramatic changes in our solar system that occurred long before humans. Here's how we're studying them.

The path through the solar system is a rocky road. Asteroids, comets, Kuiper Belt Objects—all kinds of small bodies of rock, metal and ice are in constant motion as they orbit the Sun. But what’s the difference between them? Why do these miniature worlds fascinate space explorers so much?

A team of researchers have found a distant Kuiper Belt Object with an orbit that supports the theory of a distant, undiscovered large planet on the far edge of our solar system.

NASA's New Horizons science team recently wrapped up a three-day rehearsal of the busiest days around the mission's Dec. 31- Jan. 1 flyby of a Kuiper Belt object orbiting a billion miles beyond Pluto.

NASA's New Horizons spacecraft has made its first detection of its next flyby target, the Kuiper Belt object nicknamed Ultima Thule, more than four months ahead of its New Year's 2019 close encounter.

As NASA’s New Horizons mission continues exploring the unknown, the mission team has selected a highly appropriate nickname for its next flyby target in the outer reaches of the solar system.

In this episode of Gravity Assist, Jim Green talks with New Horizons Principal Investigator Alan Stern about what we’ve learned about Kuiper Belt object 2014 MU69 and the remarkable story of how -- against all odds -- the New Horizons team captured MU69’s fleeting shadow on Earth as the object passed in front of a distant star.

In just under a year – shortly after midnight Eastern Time on Jan. 1, 2019 – NASA’s New Horizons spacecraft will buzz by the most primitive and most distant object ever explored.

2014 MU69 may have a companion: a small moon.

Billions of kilometers from Earth, beyond the orbit of Neptune, lies perhaps the most forbidding part of our solar system, a vast realm so cold and dark it sparks a frisson of dread among thoughtful astronauts.

Astronomers from Lowell Observatory, the Massachusetts Institute of Technology, and the Large Binocular Telescope Observatory have discovered an icy planetary body orbiting the Sun beyond Neptune in the Kuiper Belt roughly equal in size to Pluto's moon Charon.