Ultima Thule in color

Solar System

Initial Results from the Ultima Thule Flyby

NASA's New Horizons made history when it flew by "Ultima Thule" on New Year's Day, but the science return is only beginning. Here's the latest from mission principal investigator Alan Stern.

Ultima Thule (art)

Solar System

New Horizons: Ultima Thule is Dead Ahead

Ultima Thule, the next target for the New Horizons mission, is getting ever bigger within the spacecraft's sights. Alan Stern brings us the latest update on preparations for the New Year's Day flyby.

Illustration of New Horizons flying by Ultima Thule

Space Missions

Planning the New Horizons Exploration of Ultima Thule

Alan Stern, principal investigator of NASA's New Horizons mission, gives a detailed preview of what the spacecraft will be doing in the days up to, during, and after the impending flyby of the Kuiper Belt Object 2014 MU69.

Illustration of New Horizons flying past 2014 MU69

Space Missions

New Horizons On Approach to the First Exploration of a Kuiper Belt Object

Take a look behind the scenes as the New Horizons team gears up for the historic first flyby of a body in the remote Kuiper Belt, in this first of a four-part series from the mission's Principal Investigator Alan Stern.

Alan Stern surprised

Space Missions

"Top 10" Surprises from the Pluto Flyby

New Horizons' principal investigator describes the most amazing discoveries made when NASA's New Horizons spacecraft flew past Pluto last July.

New Horizons in Kuiper Belt

Space Missions

New Horizons: A Billion Miles to 2014 MU69

Planetary scientist Alan Stern continues his exclusive series of blogs with details of what awaits the New Horizons spacecraft when it reaches its next objective.

Informal names on Pluto

Space Missions

Alan Stern: What We Found at Pluto

It sounds like science fiction, but it's not: NASA's New Horizons mission explored the Pluto system this summer!

Science instruments on New Horizons

Solar System

What Will New Horizons See — and When?

In his third "insider blog" about the New Horizons mission, principle investigator Alan Stern offers a look at the timetable for getting results from the historic flyby.

New Horizons' scientific payload

Space Missions

Pluto: The Last Picture Show

In his second "insider blog" about the New Horizons mission, principle investigator Alan Stern offers a look at what we might find at Pluto. It sounds like science fiction, but it's not: NASA's New Horizons spacecraft is on final approach to the Pluto system! After 112 months in flight, the…

Alan Stern awaits New Horizons's launch

Solar System

New Horizons: Navigating to Pluto

In the first of a series of installments written exclusively for Sky & Telescope, New Horizons principal investigator Alan Stern offers his behind-the-scenes perspective on what it took to get the spacecraft to Pluto.

Science and Space Policy

Help Uwingu Make a Difference in Space

Uwingu, a small start-up company, wants to change the way science educators, astronomers, and space researchers do business.

Astronomy & Observing News

Dwarf Planets Are Planets Too: Get Involved!

An eminent planetary scientist and former Associate Administrator of Space Science for NASA argues why Pluto should be called a planet.