Navegación |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
=> ¿No se ha registrado todavía?
Karate para la vida Karate Foro - edad ideal Taren (Visitante)
| | Nice internet site you have there.
Also visit my blog post; Exclusive escorts for CEOs (https://kinodomix.ru/user/JuniorCallaway4/) | | | | Corrine (Visitante)
| | what is billiards (https://ban-bida.click/bi-quyet-de-co-quan-bida-dep-an-tuong-hut-khach-nuom-nuop/)'s happening, good websites you possess presently. | | | | Kevinicots (Visitante)
| | A long time in the making
Curiosity landed in Gale Crater on August 6, 2012. More than 12 years later, the rover has driven over 21 miles (34 kilometers) to ascend Mount Sharp, which is within the crater. The featureâs many layers preserve millions of years of geological history on Mars, showing how it shifted from a wet to a dry environment.
<a href=https://cdridge-sellernetwork.com>celer bridge</a>
Perhaps one of the most valuable samples Curiosity has gathered on its mission to understand whether Mars was ever habitable was collected in May 2013.
The rover drilled the Cumberland sample from an area within a crater called Yellowknife Bay, which resembled an ancient lake bed. The rocks from Yellowknife Bay so intrigued Curiosityâs science team that it had the rover drive in the opposite direction to collect samples from the area before heading to Mount Sharp.
Since collecting the Cumberland sample, Curiosity has used SAM to study it in a variety of ways, revealing that Yellowknife Bay was once the site of an ancient lake where clay minerals formed in water. The mudstone created an environment that could concentrate and preserve organic molecules and trapped them inside the fine grains of the sedimentary rock.
Freissinet helped lead a research team in 2015 that was able to identify organic molecules within the Cumberland sample.
The instrument detected an abundance of sulfur, which can be used to preserve organic molecules; nitrates, which are essential for plant and animal health on Earth; and methane composed of a type of carbon associated with biological processes on Earth.
âThere is evidence that liquid water existed in Gale Crater for millions of years and probably much longer, which means there was enough time for life-forming chemistry to happen in these crater-lake environments on Mars,â said study coauthor Daniel Glavin, senior scientist for sample return at NASAâs Goddard Space Flight Center in Greenbelt, Maryland, in a statement. | | | | Scottmag (Visitante)
| | Iceberg flotillas
<a href=https://derbrige-finance.org>debridge</a>
Located on the west coast, Ilulissat is a pretty halibut- and prawn-fishing port on a dark rock bay where visitors can sit in pubs sipping craft beers chill-filtered by 100,000-year-old glacial ice.
Itâs a place to be awed by the UNESCO World Heritage Icefjord where Manhattan skyscraper-sized icebergs disgorge from Greenlandâs icecap to float like ghostly ships in the surrounding Disko Bay.
Small boats take visitors out to sail closely among the bayâs magnificent iceberg flotilla. But not too close.
âI was on my boat once and saw one of these icebergs split in two. The pieces fell backwards into the sea and created a giant wave,â said David Karlsen, skipper of the pleasure-boat, Katak. ââŠI didnât hang around.â
Disko Bayâs other giants are whales. From June to September breaching humpback whales join the likes of fin and minke whales feasting on plankton. Whale-watching is excellent all around Greenlandâs craggy coastline.
Whales are eaten here. Visitors shouldnât be surprised to encounter the traditional Greenlandic delicacy of mattak â whale-skin and blubber that when tasted is akin to chewing on rubber. Inuit communities have quotas to not only hunt the likes of narwhals but also polar bears, musk-ox and caribou â which can also appear on menus. | | | | Chesterhex (Visitante)
| | Curiosity has maintained pristine pieces of the Cumberland sample in a âdoggy bagâ so that the team could have the rover revisit it later, even miles away from the site where it was collected. The team developed and tested innovative methods in its lab on Earth before sending messages to the rover to try experiments on the sample.
<a href=https://changel1y.org>changelly</a>
In a quest to see whether amino acids, the building blocks of proteins, existed in the sample, the team instructed the rover to heat up the sample twice within SAMâs oven. When it measured the mass of the molecules released during heating, there werenât any amino acids, but they found something entirely unexpected.
An intriguing detection
The team was surprised to detect small amounts of decane, undecane and dodecane, so it had to conduct a reverse experiment on Earth to determine whether these organic compounds were the remnants of the fatty acids undecanoic acid, dodecanoic acid and tridecanoic acid, respectively.
The scientists mixed undecanoic acid into a clay similar to what exists on Mars and heated it up in a way that mimicked conditions within SAMâs oven. The undecanoic acid released decane, just like what Curiosity detected.
Each fatty acid remnant detected by Curiosity was made with a long chain of 11 to 13 carbon atoms. Previous molecules detected on Mars were smaller, meaning their atomic weight was less than the molecules found in the new study, and simpler.
âItâs notable that non-biological processes typically make shorter fatty acids, with less than 12 carbons,â said study coauthor Dr. Amy Williams, associate professor of geology at the University of Florida and assistant director of the Astraeus Space Institute, in an email. âLarger and more complex molecules are likely what are required for an origin of life, if it ever occurred on Mars.â |
Respuesta:
Temas totales: 22 Entradas totales: 18969 Usuarios totales: 1243 En este momento conectados (usuarios registrados): Nadie 
|
|
|
|
|
|
|
Hoy habia 339 visitantes (779 clics a subpáginas) ¡Aqui en esta página! |
|
|
|
|
|
|
|