baskets vans toile écru/bleu tissée et daim us écru 17721/bleu men us 7,5 woman us 9 6657c4b -

baskets vans toile écru/bleu tissée et daim us écru 17721/bleu men us 7,5 woman us 9 6657c4b

Item specifics

Condition: Pre-owned :
An item that has been used or worn previously. See the seller’s listing for full details and description of any imperfections.See all condition definitions- opens in a new window or tab
Seller Notes: très bon état
Marque: vans Couleur: écru/bleu
Pointure: men us 7,5 woman us 9 Matière: toile tissée/daim
Mars likely to have enough oxygen to support life: Study

PARIS - Salty water just below the surface of Mars could hold enough oxygen to support the kind of microbial life that emerged and flourished on Earth billions of years ago, researchers reported Monday (Oct 22).

In some locations, the amount of oxygen available could even keep alive a primitive, multicellular animal such as a sponge, they reported in the journal Nature Geosciences.

"We discovered that brines" - water with high concentrations of salt - "on Mars can contain enough oxygen for microbes to breathe," said lead author Vlada Stamenkovic, a theoretical physicist at the Jet Propulsion Laboratory in California.

OCHENTA Women's Canvas Wedge Heeled Platform Fashion Sneaker Pump Shoes , New Balance Women's 420 Running Lifestyle Fashion SneakerSkechers Women's Go Run Mojo-Verve Sneaker , Skechers Sport Women's Flex Appeal 2.0-Done Deal Fashion SneakerRyka Ryka705043878875 Womens Black/Coral Rose/Atomic Orange Dynamic 5 B(M) , New Balance Women's 490V5 Running Shoe , Heelys 770286 Girl's White And Purple One Wheel Canvas Trainers New , NEW VANS X A TRIBE CALLED QUEST AUTHENTIC SHOESSkechers Sport Women's Flex Appeal 2.0 Newsmaker Sneaker , Skechers Flex Appeal 2.0 Change Up Black/White , Roxy Women's North Shore Sneaker White/White Patent 10 M USSkechers Metamorphic Womens Black Breathable Skech Knit Mesh Stretch Loafers NewNEW PUMA WOMENS SUEDE PLATFORM SNEAKER , NEW MATT BERNSON SS18 WOMENS CARRERASkechers Women's D'Lites - Style Rethink White/Silver Sneaker 11 B M , Skechers Sport Women's Gratis Simply Serene Fashion Sneaker , Skechers BOBS From Women's Phresh Fashion Sneaker , Skechers Sport Women's Breathe Easy Symphony Fashion SneakerSkechers Women's Go Run Fast Invigorate SneakerAdidas F10 TRX FG Soccer Cleats - Black/Metallic Silver/Pink (Womens) , ALDO Women's Jacobe Sneaker, White, 10 B USEtnies Women's Scout W's Skate Shoe , Skechers Sport 22532 Womens Breathe Easy Jackpot Fashion Sneaker, Black, 7 M USKeds Women's Kickstart Fashion Sneaker - Choose SZ/ColorWomen's Lido Slip On Sneaker Shoe Black/Armor 9 M US , Skechers Women's Vaso-Bueno-Perfed Twin-Gore Slip Air-Cooled Memory Foam Sneaker , Reebok Arion Women's Comp Toe/SD Low Athletic 06.5 M, Purple/Yellow , Keds Women's Champion Metallic Linen Sneaker - Choose SZ/Color , Keds Women's Coursa Metallic Sneaker - Choose SZ/Color ,

"This fully revolutionises our understanding of the potential for life on Mars, today and in the past," he told AFP.

Up to now, it had been assumed that the trace amounts of oxygen on Mars were insufficient to sustain even microbial life.

"We never thought that oxygen could play a role for life on Mars due to its rarity in the atmosphere, about 0.14 per cent," Stamenkovic said.

By comparison, the life-giving gas makes up 21 per cent of the air we breathe.

On Earth, aerobic - that is, oxygen breathing - life forms evolved together with photosynthesis, which converts CO2 into O2. The gas played a critical role in the emergence of complex life, notable after the so-called Great Oxygenation Event some 2.35 billion years ago.

But our planet also harbours microbes - at the bottom of the ocean, in boiling hot springs - that subsist in environments deprived of oxygen.

"That's why - whenever we thought of life on Mars - we studied the potential for anaerobic life," Stamenkovic.


The new study began with the discovery by Nasa's Curiosity Mars rover of manganese oxides, which are chemical compounds that can only be produced with a lot of oxygen.

Curiosity, along with Mars orbiters, also established the presence of brine deposits, with notable variations in the elements they contained.

A high salt content allows for water to remain liquid - a necessary condition for oxygen to be dissolved - at much lower temperatures, making brines a happy place for microbes.

Depending on the region, season and time of day, temperatures on the Red Planet can vary between minus 195 and 20 deg C.

The researchers devised a first model to describe how oxygen dissolves in salty water at temperatures below freezing.

A second model estimated climate changes on Mars over the last 20 million years, and over the next 10 million years.

Taken together, the calculations showed which regions on the Red Planet are most likely to produce brine-based oxygen, data that could help determine the placement of future probes.

"Oxygen concentrations (on Mars) are orders of magnitude" - several hundred times - "greater than needed by aerobic, or oxygen-breathing - microbes," the study concluded.

Daniel Green Meg Women's Bone Slip-On Loafer 12MYS Yosi Samra Mirah Ballet Flats Suede Patent Leather Cap Toe US 8M WomenBare Traps Womens Hastings Fabric Low Top Walking, Lavender, Size 7.0 38ILC Lauren Conrad Womens Size 8.5 Burgundy Kiltie Loafers Slip On Flats ShoesFS NY Suede Leopard Print Ballet Flats 7.5 M , NIB Gianni Bini GB Street Beatz Slip On Espadrilles Sz 7 , OLUKAI SAMPLE 20225 WOMEN'S HELEUMA MESH SNEAKER SHOES CONVERTS TO SLIDE US 7 , MULES / CHAUSSURES PLATES FRATELLI ROSSETTI ! CHAUSSURE RENTREE/ NEUF: ! T39T.U.K. Anarchic Size 11 Womens Leather Kitty Cat Mary Jane White Black ShoesMerrell Jungle Moc Casual Shoes - Women's Size 8, BlackSperry Top-Sider Avery Flat Loafers, Black Leather, 8.5 US / 39.5 EUKS35 Kaydan Block Heel Loafers, Grey Plaid, 8.5 US DisplayMerrell Women's Mimosa Band Dusty Olive Slip On Walking Hiking Shoes Size 6 , Nike Flex Contact Athletic Shoe - Women's Size 8.5, Black/WhiteKEEN Presidio Burgundy Nubuck Bumper Hiking Trail Outdoor Shoes Women's Size 7 , Womens 10 M 42 Nike Core Motion TR2 Running Cross Training Shoes Gray 749180-009 , Women's Skechers SHOES WOMENS SIZE 4 Less Expensive FlatsConverse - Women's CT AS Shoreline Slip Sneakers, Mica GreenPleaser Pink Label Women's Fab 422 Open-Toe Pump Black Satin HeelsNIKE W WOMEN'S ZOOM TENNIS CLASSIC AC / FGMT FRAGMENT 864295-001 BLACK SZ: 7.5Fila Women's Memory Fresh Start Slip Resistant Work Shoe 6.5 M US , Minion High Tops women's size 9-9 1/2LE COQ SPORTIF Deauville Fluo Women's Shoes 1310843 *Size 4.5 (USA) 36 (EUR)On Cloudflyer Athletic Shoes - Women's Size 6.5, Maui/Lemon , VANS Rhea SF (Square Perf) Gossamer Green Suede Boots WOMEN'S 10 , ASICS GEL-Frequency 3 Walking Shoes - Women's Size 9.5 - BlueSkechers Performance Women's Go Outdoor Walking Shoe, Color OptionsNIKE TRAINING/RUNNING SHOES WOMENS SIZE 38/8Skechers Women's Vaso Mitad TAN 49745/TAN , Altra Women's Olymous 1.5 Gray/Mint Trail-Running Shoes 5.5M

"Our results do not imply that there is life on Mars," Stamenkovic cautioned. "But they show that the Martian habitability is affected by the potential of dissolved oxygen."

More aboutSpace and cosmos
Purchase this article for republication.
Your daily good stuff - AsiaOne stories delivered straight to your inbox

baskets vans toile écru/bleu tissée et daim us écru 17721/bleu men us 7,5 woman us 9 6657c4b -

baskets vans toile écru/bleu tissée et daim us écru 17721/bleu men us 7,5 woman us 9 6657c4b
By signing up, you agree to our Privacy policy and Terms and Conditions.