Articles

Emily Lakdawalla

A radar instrument on one of the oldest operational Mars orbiters has discovered possible evidence of present-day liquid water on Mars.

Jatan Mehta

Where did the Moon come from? The origin of our cosmic neighbor is a fundamental question in planetary science.

Melissa Lane

Petrology is a field of science in which scientists study the compositions of rocks and minerals and interpret their geologic history. A common graph petrologists use is the “pyroxene quadrilateral.” These graphs, like photos of space, can reveal an understanding of the remotest parts of the solar system.

Geoffrey Reeves

At five years and counting, the Van Allen Probes mission continues to reshape our thinking about how Earth’s radiation belts flex and reconfigure under the influence of solar storms.

Emily Lakdawalla

One of the Cassini mission's goals was to figure out how long a day on Saturn is. We still don't know. A new paper reports a measurement of the rotation period of Saturn that is different from past measurements.

Emily Lakdawalla

A Mercury meeting held May 1-3 summarized the current and future science of the innermost planet. Emily Lakdawalla was there and shares her notes.

Emily Lakdawalla

What is the surface of a comet like? That's one of the main questions that motivated Philae's mission to the surface of comet 67P/Churyumov-Gerasimenko. We now know the comet has a rigid crust about 10 to 50 centimeters thick, below which the comet is much more fluffy.

Jake Robins

Mars today is a dynamic place. One visually dramatic sign of change on Mars is

Konstantin Batygin

Caltech planetary scientist Konstantin Batygin pays tribute to a pioneer in celestial mechanics.

Emily Lakdawalla

Results from the Juno gravity science experiment presented at last week's American Geophysical Union meeting suggest Jupiter's winds penetrate only to 3000 kilometers deep.

Emily Lakdawalla

Today's story from the Division for Planetary Sciences meeting looks at one youthful rayed crater on the Moon from many different spacecraft.

Emily Lakdawalla

James Tuttle Keane is increasingly famous (among planetary scientists anyway) for his remarkable illustrated notes from conferences. Here's his work from the Division for Planetary Sciences meeting, illustrating both his own and others' research.

Emily Lakdawalla

Three years ago, on October 19, 2014, comet C/2013 A1 Siding Spring passed within 138,000 kilometers of Mars. At the 2017 meeting of the Division for Planetary Sciences of the American Astronomical Society, we heard a progress report on Mars orbiter imaging of the comet's nucleus.

Emily Lakdawalla

The team reported two weeks ago that the first attempts at observing 2014 MU69 were unsuccessful. But in their third try, on July 17, astronomers in Argentina saw the telltale sign of MU69's presence: a stellar wink.

Heidi Stauffer

Stratigraphic columns are a basic tool in geology, used on both Earth and Mars to tell the story of a location. But what are they really?

Heather Hunter

Heather Hunter brings us the next installment in her series on radio detection and ranging.

Heather Hunter

Heather Hunter explains how radar works and what it's used for on Earth and beyond.

Cassie Stuurman

Martian radar expert Cassie Stuurman explains how the SHARAD instrument aboard NASA's Mars Reconnaissance Orbiter was used to detect buried ice deposits.

Emily Lakdawalla

Last week's Division for Planetary Sciences/European Planetary Science Congress meeting was chock-full of science from New Horizons at Pluto.

Emily Lakdawalla

The third-largest object known beyond Neptune, 2007 OR10, has a moon. The discovery was reported in a poster by Gábor Marton, Csaba Kiss, and Thomas Mueller at the joint meeting of the European Planetary Science Congress and the Division for Planetary Sciences of the American Astronomical Society (DPS/EPSC) on Monday.