News / Science & Technology

NASA’S Curiosity Rover Provides Clues to Changes in Martian Atmosphere

VOA News
In its ongoing two-year mission to explore Mars for evidence that the planet might once have harbored life, the rover Curiosity has paused to take a deep sniff of the Martian atmosphere, which is 100 times thinner than Earth’s.

The first complete air analysis at the Gale Crater suggest that a fraction of the Martian atmosphere has been lost over billions of years through a physical process that favors retention of heavier isotopes of carbon dioxide gas.  The loss of a lighter form of carbon dioxide might have played a significant role in the evolution of the planet, NASA scientists say.   

Curiosity's "Sample Analysis at Mars" or SAM instrument package made the most sensitive measurements so far in a search for methane, which could indicate conditions favorable for microbial life.  Methane is difficult to detect from Earth or the current generation of Mars orbiters because the gas exists on Mars only in traces, if at all, says Chris Webster of NASA’s Jet Propulsion Laboratory.  "At this point in the mission," Webster says,"we’re just excited about searching for it."

Webster added that atmospheric variability in the Martian atmosphere could hold some surprises.

The mission, now in its third month, is set to analyze its first solid soil sample, beginning an ambitious two-year search for organic compounds in the rocks and soils of Gale Crater as well as more atmospheric samples.

According to principal investigator Paul Mahaffy of NASA’s Goddard’s Space Flight Center in Greenbelt, Maryland, "both atmospheric and solid sample analyses are crucial for understanding Mars’ habitability."

You May Like

Koreas Mark 61st Anniversary of War Armistice

Muted observances on both sides of heavily-armed Demilitarized Zone that separates two decades-long enemies More

Judge Declares Washington DC Ban on Public Handguns Unconstitutional

Ruling overturns capital city's prohibition on carrying guns in pubic More

Pricey Hepatitis C Drug Draws Criticism

Activists are using the International AIDS Conference to criticize drug companies for charging high prices for life-saving therapies More

Featured Videos

Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
Students in Business for Themselvesi
X
Mike O'Sullivan
July 26, 2014 11:04 AM
They're only high school students, but they are making accessories for shoes, fabricating backpacks and doing product photography - all through their own businesses. It's the result of a partnership between a non-profit organization that teaches entrepreneurship and their schools. VOA's Mike O'Sullivan and Deyane Moses met the budding entrepreneurs near Los Angeles.
Video

Video Students in Business for Themselves

They're only high school students, but they are making accessories for shoes, fabricating backpacks and doing product photography - all through their own businesses. It's the result of a partnership between a non-profit organization that teaches entrepreneurship and their schools. VOA's Mike O'Sullivan and Deyane Moses met the budding entrepreneurs near Los Angeles.
Video

Video Astronauts Train in Underwater Lab

In the world’s only underwater laboratory, four U.S. astronauts train for a planned visit to an asteroid. The lab - called Aquarius- is located five kilometers off Key Largo, in southern Florida. Living in close quarters and making excursions only into the surrounding ocean, they try to simulate the daily routine of a crew that will someday travel to collect samples of a rock orbiting far away from earth. VOA’s George Putic has more.
Video

Video Not Even Monks Spared From Thailand’s Junta-Backed Morality Push

With Thailand’s military government firmly in control after May’s bloodless coup, authorities are carrying out plans they say are aimed at restoring discipline, morality and patriotism to all Thais. The measures include a crackdown on illegal gambling, education reforms to promote students’ moral development, and a new 24-hour phone hotline for citizens to report misbehaving monks. Steve Sandford reports from Bangkok.
Video

Video Virtual Program Teaches Farming Skills

In a fast-changing world beset by unpredictable climate conditions, farmers cannot afford to ignore new technology. Researchers in Australia are developing an online virtual world program to share information about climate change and more sustainable farming techniques for sugar cane growers. As VOA's Zlatica Hoke reports, the idea is to create a wider support network for farmers.
Video

Video Airline Expert: Missile will Show Signature on Debris

The debris field from Malaysia Airlines Flight 17 is spread over a 21-kilometer radius in eastern Ukraine. It is expected to take investigators months to sort through the airplane pieces to learn about the missile that brought down the jetliner and who fired it. VOAs Carolyn Presutti explains how this work will be done.
Video

Video Treatment for Childhood Epilepsy Heats up Medical Marijuana Debate

In the United States, marijuana is classed as an illegal drug by the federal government. But nearly half the states have legalized it, to some degree. Proponents say some strains of marijuana might have exceptional health benefits, for treating pain or inflammation in chronic conditions such as cancer, multiple sclerosis and epilepsy. Shelley Schlender reports on a strain of medical marijuana developed in Colorado that is reputed to reduce seizures in childhood epilepsy
Video

Video Airbus Adds Metal 3D Printed Parts to New Jets

By the end of this year, European aircraft manufacturing consortium Airbus plans to deliver the first of its new, extra-wide-body passenger jets, the A350-XWB. Among other technological innovations, the new plane will also incorporate metal parts made in a 3-D printer. VOA's George Putic has more.
Video

Video AIDS Conference Welcomes Exciting Developments in HIV Treatment, Prevention

Significant strides have been made in recent years toward the treatment and prevention of HIV, the virus that causes AIDS. This year, at the International AIDS Conference, the AIDS community welcomed progress on a new pill that may prevent transmission of the deadly virus. VOA’s Anita Powell reports from Melbourne, Australia.
Video

Video IAEA: Iran Turns its Enriched Uranium Into Less Harmful Form

Iran has converted its stockpiles of enriched uranium into a less dangerous form that is more difficult to use for nuclear weapons, according to the United Nations’ Atomic Energy Agency. The move complies with an interim deal reached with Western powers on Iran's nuclear program last year, in exchange for easing of sanctions. Henry Ridgwell reports for VOA from London.

AppleAndroid