June 24, 2014
Aluminum-Bearing Site on Mars Draws NASA Visitor
With its solar panels their cleanest in years, NASA's decade-old Mars Exploration Rover Opportunity is inspecting a section of crater-rim ridgeline chosen as a priority target due to evidence of a water-related mineral.
Orbital observations of the site by another NASA spacecraft, Mars Reconnaissance Orbiter, found a spectrum with the signature of aluminum bound to oxygen and hydrogen. Researchers regard that signature as a marker for a mineral called montmorillonite, which is in a class of clay minerals called smectites. Montmorillonite forms when basalt is altered under wet and slightly acidic conditions. The exposure of it extends about 800 feet (about 240 meters) north to south on the western rim of Endeavour Crater, as mapped by the orbiter's Compact Reconnaissance Imaging Spectrometer for Mars (CRISM).
"It's like a mineral beacon visible from orbit saying, 'Come check this out,'" said Opportunity Principal Investigator Steve Squyres, of Cornell University, Ithaca, New York.
June 19, 2014
Comet’s Brush With Mars Offers Opportunity, Not Danger
University of Maryland
Comet Siding Spring will brush astonishingly close to Mars later this year – close enough to raise concerns about the safety of three spacecraft orbiting the Red Planet. But after observing Siding Spring through a satellite-mounted telescope, University of Maryland comet experts found that it poses little danger to the Mars craft. The NASA spacecraft will be able to get an unprecedented close look at the changes happening to this “fresh” comet as it nears the sun – as well as any changes its passing may trigger in the Martian atmosphere.
Fresh comets like Siding Spring, which have never before approached the sun, contain some of the most ancient material scientists can study. The UMD astronomers’ observations are part of a two-year-long research campaign to watch how the comet's activity changes during its travels.
May 24, 2014
Mars Weathercam Spots Big New Crater
Before and after shots taken by a Mars-orbiting satellite have detected a newly created impact crater half the size of a football field near the planet's equator.
NPR's Joe Palca says that while objects are striking Mars all the time (with big chunks surviving until impact, thanks to the Red Planet's thin atmosphere), this is the first time scientists have been able to determine the exact day a meteor struck – in this case, sometime on March 28, 2012.
But it wasn't noticed until two months ago.
March 19, 2014
NASA Orbiter Finds New Gully Channel on Mars
A comparison of images taken by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter in November 2010 and May 2013 reveal the formation of a new gully channel on a crater-wall slope in the southern highlands of Mars. Gully or ravine landforms are common on Mars, particularly in the southern highlands. This pair of images shows that material flowing down from an alcove at the head of a gully broke out of an older route and eroded a new channel. The dates of the images are more than a full Martian year apart, so the observations did not pin down the Martian season of the activity at this site. Before-and-after HiRISE pairs of similar activity at other sites demonstrate that this type of activity generally occurs in winter, at temperatures so cold that carbon dioxide, rather than water, is likely to play the key role.
March 6, 2014
Big Mars Impact Gave Earth Most of Its Martian Meteorites
A huge meteorite impact on Mars five million years ago blasted toward Earth many of the rocks that scientists scrutinize to learn more about the Red Planet, a new study reveals.
The cosmic crash left a 34-mile-wide (55 kilometers) gouge on Mars called Mojave Crater and is the source of all "shergottite" or igneous rock Martian meteorites found on Earth, researchers say. Examining the crater and the meteorites also led to new revelations about how old the rocks are.
February 12, 2014
Study: Water could be flowing on Mars now
The presence of water on Mars is often talked about in the past tense -- as in, billions of years in the past. But researchers have found clues that water could be flowing in the present, at least during warm seasons.
Researchers at Georgia Institute of Technology are looking at dark features on Martian slopes that are finger-shaped. They appear and disappear seasonally.
These flows represent the best suggestion we know of that Mars has water right now, scientists say. The study is published in the journal Geophysical Research Letters.
In 2011, Lujendra Ojha and his colleagues announced the evidence for possible saltwater flows on Mars. They published a study in the journal Science based on data from the HiRISE camera aboard NASA's Mars Reconnaissance Orbiter.
January 22, 2014
Large international interest in riding with NASA’s next Mars Rover
The next NASA rover to be sent to the surface of Mars has received twice the usual amount of proposals for carrying science and exploration technology instruments. The agency is reviewing a total of 58 submitted proposals, 17 of which came from international partners, ahead of a proposed mission in 2020. Announced at the end of 2012, the next NASA rover will be based on the Curiosity Rover that is currently exploring the surface of Mars.
December 18, 2013
An Updated Mars Exploration Family Portrait
The Planetary Society
The Mars Exploration Family Portrait shows every dedicated spacecraft mission to Mars, and now includes India’s Mars Orbiter Mission and NASA's MAVEN. The dates listed are for launch.
December 9, 2013
The Mists of Mars
The Planetary Society
Late last month, visitors to Grand Canyon National Park in Arizona witnessed a rare and spectacular sight. A temperature inversion (where a layer of cold air is trapped beneath warm air) led to a canyon filled to the brim with clouds. On the very same day, a robotic spacecraft at the planet Mars captured a similar scene. This one was a much more common event, but one that still makes for incredible imagery. Valles Marineris is a network of canyons that in many ways looks similar to the Grand Canyon--except that at more than 4,000 kilometers in length, if it were on Earth it would stretch across most of the United States.
This canyon, too, sometimes fills with clouds, made of tiny particles of water ice, though it's not caused by an inversion. Despite the Red Planet's well-earned reputation as a dry desert, there are hints of water on its surface and in its atmosphere. The Mars Color Imager (MARCI) on board the Mars Reconnaissance Orbiter makes daily observations of the entire planet. On November 29 and 30, MARCI returned pictures of wispy clouds clinging to the summits of Olympus Mons and the other towering volcanoes. It also showed Valles Marineris, a long horizontal scar probably formed in part by the tectonic effects of all those volcanoes. As happens seasonally, the canyon was clearly filled with clouds.
October 2, 2013
Mars Reconnaissance Orbiter achieves imaging of comet ISON from Mars
The Planetary Society
Yesterday, the much-anticipated comet ISON made its closest pass by Mars. Despite the government shutdown, all NASA spacecraft are still operating normally, and Mars Reconnaissance Orbiter, Curiosity, and Opportunity have all attempted imaging over the last several days. Mars Reconnaissance Orbiter's HiRISE camera is the first to achieve a positive detection of the somewhat-fainter-than-expected comet in its photos.
October 1, 2013
As Comet ISON sweeps past Mars today, most observations will happen
Despite the U.S. government shutdown today, it appears that many planned observations of Comet ISON – as it sweeps dramatically close to the planet Mars today – will happen. NASA has a skeleton crew in support of the six crew members aboard International Space Station (ISS) in place, so presumably they will observe Comet ISON today, as previously announced. Likewise, the Mars Reconnaissance Orbiter’s HiRISE instrument will be turned in Comet ISON’s direction today, according to Anjani Polit, the HiRISE Uplink Lead.
September 19, 2013
Could Upcoming Comet Flybys Damage Mars Spacecraft?
Two comets will buzz Mars over the course of the next year, prompting excitement as well as some concern that cometary particles could hit the spacecraft orbiting the Red Planet and exploring its surface.
Three operational spacecraft currently circle Mars: NASA's Odyssey and Mars Reconnaissance Orbiter (MRO), as well as Europe’s Mars Express. NASA also has two functioning rovers, Curiosity and Opportunity, on the ground on Mars.
All of these spacecraft will have ringside seats as Comet ISON cruises by Mars this year, followed by Comet 2013 A1 (Siding Spring) in 2014.
April 4, 2013
Mars missions scaled back in April because of sun
It's the Martian version of spring break: Curiosity and Opportunity, along with their spacecraft friends circling overhead, will take it easy this month because of the sun's interference.
For much of April, the sun blocks the line of sight between Earth and Mars. This celestial alignment — called a Mars solar conjunction — makes it difficult for engineers to send instructions or hear from the flotilla in orbit and on the surface.
Such communication blackouts occur every two years when the red planet disappears behind the sun. No new commands are sent since flares and charged particles spewing from the sun can scramble transmission signals and put spacecraft in danger.
April 3, 2013
Used Parachute on Mars Flaps in the Wind
Photos from NASA's Mars Reconnaissance Orbiter show how the parachute that helped NASA's Curiosity rover land on Mars last summer has subsequently changed its shape on the ground.
The images were obtained by the High Resolution Imaging Science Experiment (HiRISE) camera on Mars Reconnaissance Orbiter.
Seven images taken by HiRISE between Aug. 12, 2012, and Jan. 13, 2013, show the used parachute shifting its shape at least twice in response to wind.
March 28, 2013
Why a Mars Comet Impact Would be Awesome
When Jupiter’s tides ripped Comet Shoemaker–Levy 9 to shreds, only for the icy chunks to succumb to the intense Jovian gravity, ultimately slamming into the gas giant’s atmosphere, mankind was treated to a rare cosmic spectacle (in human timescales at least). That was the first time in modern history that we saw a comet do battle with a planet… and lose.
But next year, astronomers think there’s a chance — albeit a small one — of a neighboring planet getting punched by an icy interplanetary interloper. However, this planet doesn’t have a generously thick atmosphere to soften the blow. Rather than causing bruises in a dense, molecular hydrogen atmosphere, this comet will pass through the atmosphere like it wasn’t even there and hit the planetary surface like a cosmic pile-driver, ripping into the crust.
What’s more, we’d have robotic eyes on the ground and in orbit should the worst happen.
Additional Articles in this Category