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You are browsing the archive for Journal of Geophysical Research: Planets Archives - AGU Blogosphere.

27 April 2020

New Mexico badlands help researchers understand past Martian lava flows (video)

Planetary scientists are using a volcanic flow field in New Mexico to puzzle out how long past volcanic eruptions on Mars might have lasted, a finding that could help researchers determine if Mars was ever hospitable to life. People don’t usually think of New Mexico as a volcanically active place, but it has some of the youngest (geologically speaking) large lava flows in the continental United States.

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12 November 2019

With Mars methane mystery unsolved, Curiosity serves scientists a new one: Oxygen

For the first time in the history of space exploration, scientists have measured the seasonal changes in the gases that fill the air directly above the surface of Gale Crater on Mars. As a result, they noticed something baffling: oxygen, the gas many Earth creatures use to breathe, behaves in a way that so far scientists cannot explain through any known chemical processes.

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16 October 2019

Ancient Moon rock provides evidence of giant lunar impact 4.3 billion years ago

An Apollo 16 lunar rock sample shows evidence of intense meteorite bombardment on the Moon 4.3 billion years ago, according to new research. The results provide new insights for the Moon’s early history, showing lunar impacts were common throughout the Moon’s formation than previously thought.

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1 October 2019

Water distribution affects exoplanets’ habitable zone

A new study finds land planets, which have equal to or less than 10 percent of the volume of Earth’s water, can remain habitable at a closer distance to their host star if most of their water is at the planet’s poles. This means the habitable zone for these types of planets may be different than previously assumed.

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23 September 2019

Ice islands on Mars and Pluto could reveal past climate change

Many of the craters of Mars and Pluto feature relatively small ice islands unattached to their polar ice caps. These ice islands could be records of past climate change on Mars and Pluto, and could also provide clues about the workings of Martian water and ice, according to a new study in AGU’s Journal of Geophysical Research: Planets.

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3 September 2019

Mercury’s ancient magnetic field likely evolved over time

Mercury’s ancient magnetic poles were far from the location of its poles today, implying its magnetic field, like Earth’s, changed over time, a new study says.

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29 July 2019

Study suggests frozen Earthlike planets could support life

Icy planets once thought too cold to support life might have livable land areas above freezing, challenging the typical assumption of what kinds of planets might be habitable, a new study suggests.

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18 April 2019

The Moon’s crust is really cracked

The bombardment of asteroids and meteoroids that pockmarked the Moon’s surface over the eons also created fractures reaching deep into the lunar crust, report researchers in a new study in AGU’s Journal of Geophysical Research: Planets.

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25 March 2019

Laser Blasts Show Asteroid Bombardment, Hydrogen Make Great Recipe for Life on Mars

A new study reveals asteroid impacts on ancient Mars could have produced key ingredients for life if the Martian atmosphere was rich in hydrogen. An early hydrogen-rich atmosphere on Mars could also explain how the planet remained habitable after its atmosphere thinned.

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1 March 2019

First evidence of planet-wide groundwater system on Mars

Mars Express has revealed the first geological evidence of a system of ancient interconnected lakes that once lay deep beneath the Red Planet’s surface, five of which may contain minerals crucial to life.

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26 February 2019

New map reveals geology and history of Pluto’s moon Charon

What a difference a planetary flyby makes. Pluto’s moon Charon — once no more than a fuzzy blob of pixels beside a larger blob — now has its first geological map, published in AGU’s Journal of Geophysical Research: Planets.

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30 January 2019

New study estimates amount of water in near-Earth space rocks

The study’s authors estimate there are between 400 and 1200 billion kilograms (440 to 1.3 billion U.S. tons) of water that could be extracted from the minerals in these asteroids. In liquid terms, that’s between 400 billion and 1,200 billion liters (100 billion and 400 billion U.S. gallons) of water. That’s enough to fill between 160,000 and 480,000 Olympic-sized swimming pools.

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18 September 2018

Mercury and its depressions

One of the most surprising discoveries of the NASA’s Messenger mission was the presence of unusual, bright, irregular and rimless flat-floored depressions on the surface of Mercury. These depressions, called hollows, are usually found on crater walls, rims, floors and central peaks. Since the hollows appear fresh, they may be actively forming today through a mechanism that could involve the loss of volatile compounds, but understanding how the hollows formed is still a major challenge for scientists.

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6 September 2018

Mysterious ‘lunar swirls’ point to moon’s volcanic, magnetic past

The mystery behind lunar swirls, one of the solar system’s most beautiful optical anomalies, may finally be solved thanks to a joint Rutgers University and University of California Berkeley study. The solution hints at the dynamism of the moon’s ancient past as a place with volcanic activity and an internally generated magnetic field. It also challenges our picture of the moon’s existing geology.

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18 July 2018

Martian atmosphere behaves as one

New research using a decade of data from the European Space Agency’s Mars Express mission has found clear signs of the complex Martian atmosphere acting as a single, interconnected system, with processes occurring at low and mid levels significantly affecting those seen higher up.

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10 July 2018

Scientists discover “ghost dunes” on Mars

Scientists have discovered hundreds of crescent-shaped pits on Mars where sand dunes stood billions of years ago. The curves of these ancient dune impressions record the direction of prevailing winds on the Red Planet, providing potential clues to Mars’s past climate, and may hold evidence of ancient life.

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6 June 2018

Scientists solve lunar mystery with aid of missing Moon tapes

After eight years spent recovering lost Moon data from the Apollo missions, scientists report in a new study they’ve solved a decades-old mystery of why the Moon’s subsurface warmed slightly during the 1970s. Scientists have wondered about the cause of the warming since soon after the Apollo missions started, when astronauts deployed probes on the Moon to measure the heat coming from its interior. The lost data tapes recovered by the scientists filled in a record gap during the 1970s and helped the researchers pinpoint the source of the warming as the Apollo astronauts themselves.

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31 May 2018

Which Mars rocks are most likely to harbor signs of life?

Iron-rich rocks near ancient lake sites on Mars could hold vital clues that show life once existed there, research suggests. These rocks – which formed in lake beds – are the best place to seek fossil evidence of life from billions of years ago, according to the researchers.

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22 May 2018

New study details geological process behind Titan’s dunes

Titan’s windswept dunes may sprawl millions of more kilometers than previously thought and were likely formed by geological processes similar to those on Earth, according to a new study. The new findings could help scientists look for life or its molecular precursors on Saturn’s largest moon.

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28 February 2018

New model suggests the Moon formed inside the vaporized Earth

A new explanation for the Moon’s origin has it forming inside the Earth when our planet was a seething, spinning cloud of vaporized rock, called a synestia.

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