Articles

Alan Stern

Back in 2005 and 2006, when Pluto’s second and third moons (Nix and Hydra) were discovered, searches by astronomers for still more moons didn’t reveal any. So the accidental discovery of Pluto’s fourth moon by the Hubble Space Telescope in mid-2011 raised the possibility that the hazards in the Pluto system might be greater than previously anticipated.

Larry Crumpler

Opportunity has finally completed the detailed survey of the outcrops on the Cape York segment of the rim of the 22-km diameter Endeavour crater.

Emily Lakdawalla

A look at an older paper describing Galileo's possible sighting of individual ring particles orbiting Jupiter as companions to its inner moon Amalthea.

Van Kane

An exciting new option to enhance NASA's OSIRIS-REx asteroid mission has been proposed by Steve Chesley at JPL. The ISIS spacecraft would impact asteroid Bennu to expose its interior structure to OSIRIS-REx.

Emily Lakdawalla

I've been out of town for a couple of days and am overwhelmed with work and an overflowing email box. So what do I do about that? I ignore what I'm supposed to be doing and play with Cassini raw image data, of course. Here is a

Sarah Hörst

A tale from the scientific trenches: laboratory work to simulate Titan's rich atmosphere.

Bill Dunford

They look so similar they can be hard to tell apart, but each hides its own mysteries.

Mat Kaplan

Planetary Radio for the week of May 6 visits the Planetary Defense Conference one last time to join a

Emily Lakdawalla

Just messing around with a recently released processed version of the Deep Impact Hartley 2 data set.

Emily Lakdawalla

Note the special time! In this week's Planetary Society hangout at 5pm PDT / midnight UTC, I'll talk with MESSENGER deputy principal investigator Larry Nittler about what MESSENGER has accomplished in its prime and extended missions at Mercury, and what it stands to do if awarded a mission extension.

A.J.S. Rayl

As the Mars Exploration Rover (MER) team waited out solar conjunction, Opportunity spent most of April atop the western rim of Endeavour Crater, conducting a chemical analysis of an ancient waterborne vein on Matijevic Hill. It was by the book until the last week of the month when the robot field geologist suffered an electronic

Marc Rayman

Marc Rayman's latest Dawn Journal explains why Dawn is currently closer to the Sun than both Ceres and Vesta.

Emily Lakdawalla

New Horizons might see a Pluto with a northern polar cap, a southern polar cap, or both caps, according to work by Leslie Young.

Bruce Betts

9-year-old Mike Puzio of North Carolina submitted the winning name for the asteroid target of NASA's OSIRIS-REx spacecraft. The Planetary Society, MIT's Lincoln Laboratory, and the University of Arizona asked students around the world to suggest names.

Emily Lakdawalla

We received more than 8000 entries from all over the world in the Name That Asteroid contest, and we can finally announce the winner. The asteroid formerly known as 1999 RQ36 is now formally named (101955) Bennu, for a heron associated with the Egyptian god Osiris.

Alex Parker

This month my latest paper made it to print in the Astronomical Journal. It's a short piece that describes a serendipitous discovery that my collaborators and I made while searching for a distant Kuiper Belt Object for the New Horizons spacecraft to visit after its 2015 Pluto flyby.

Bill Dunford

The first human beings to see the mysterious

Bruce Betts

Semifinalists ranged in age from 5 to 17 and came from the USA, Brazil, France, India, Italy, the Netherlands, and Turkey.

Emily Lakdawalla

An easy image processing trick -- using lower-resolution color data to colorize a black-and-white photo -- is relied upon by many space missions to keep data volumes low. Here's how to do it.

Mat Kaplan

Bill Nye, Bruce Betts, Mat Kaplan, Meteorite Man Geoffrey Notkin and stars of planetary science at the Planetary Defense Conference public event in Flagstaff.