![]() It is possible that all the glacier's water ice has sublimated away by now. "So, it's not surprising that we're not detecting any water ice at the surface. "Water ice is, at present, not stable at the very surface of Mars near the equator at these elevations," Lee said. The researchers don't know if any ice remains beneath the deposit. "A relatively young relict glacier in this location tells us that Mars experienced surface ice in recent times, even near the equator, which is new." And we've known about recent glacial activity on Mars, but so far, only at higher latitudes," Lee said. "We've known about glacial activity on Mars at many locations, including near the equator in the more distant past. The study authors said they think the glacier existed during the Mars Amazonian geologic period, which began 2.9 billion years ago and remains ongoing. But the fine, detailed features of the glacier still remain largely undisturbed in the salt deposit, which leads researchers to believe it's relatively "young." Mars has a thin atmosphere, which allows space rocks to collide regularly with the planet's surface. The volcanic material likely eroded over time, revealing the salty layer that captured an imprint of the glacier ice and its distinctive features, said study coauthor John Schutt, a geologist at the Mars Institute and an icefield guide in the Arctic and Antarctica. Geologically young surface ice near equator "This is the most likely explanation for the hydrated and hydroxylated sulfates we observe in this light-toned deposit." And where some of the volcanic materials came in contact with glacier ice, chemical reactions would have taken place at the boundary between the two to form a hardened layer of sulfate salts," said study coauthor Sourabh Shubham, a doctoral student of geology at the University of Maryland, College Park, in a statement. ![]() "This region of Mars has a history of volcanic activity. When mixtures of volcanic ash, lava and volcanic glass called pumice react with water, a hard, crusty salt layer can form. Scientists have an idea of how the imprint of the glacier came to be, based on evidence of volcanic material in the region. Volcanic activity creates protective layer The researchers believe the glacier was 3.7 miles (6 kilometers) long and 2.5 miles (about 4 kilometers) wide, with an elevation between 0.8 to 1.1 miles (1.3 to 1.7 kilometers). "What we think happened here is that salt formed on top of a glacier while preserving the shape of the ice below, down to details like crevasse fields and moraine bands." ![]() Pascal Lee, a senior planetary scientist with the SETI Institute and the Mars Institute, said in a statement. "What we've found is not ice, but a salt deposit with the detailed morphologic features of a glacier," lead study author Dr. The findings were shared Wednesday at the 54th Lunar and Planetary Science Conference in The Woodlands, Texas. The research team also spotted crevasse fields, or deep wedge-shaped openings that form inside glaciers. When scientists took a closer look, they recognized the features of a glacier, including ridges called moraines - debris deposited or pushed by a moving glacier. The deposits there usually contain light-colored sulfate salts. The ice mass is no longer there, but scientists spotted telltale remains among other mineral deposits near Mars' equatorial region. All features 100% free.(CNN) - The remains of a glacier have been found near the Martian equator, suggesting that some form of water could still exist in a region on the red planet where humans may one day land. This TTC tracker shows subway, rail, offline maps, navigation, planning info for the TTC. Transit Now is an app that uses Nextbus for TTC and MBTA real-time tracking, schedules, accurate predictions, arrival times, bus tracking, streetcar tracking. Got feedback? Let's chat about your commute! STL - Société de transport de Laval (Laval, Quebec) AC Transit (Alameda and Contra Costa, Oakland, California) Jacksonville Transportation Authority, JTA, (Jacksonville, Florida) "Helped me to let my kids know when the next bus is coming overall it's a wonderful app" - TTC Operator."Is hands down the better of the two " - Toronto Star. ![]() "My favourite features is 'There Yet' which sets a timer to your destination stop" - mobilesyrup."Most feature rich apps of the bunch" - blogTO.Download now for free and ride the rocket! Offline SMS, TTC operator mode, subway info and so much more. Keep you informed of unexpected bus delays, detours, subway closures. Get on with your life!Īs the assistant tells you when to catch the bus or get off your stop. No more swiping, scrolling, tapping multiple screens. Never miss your bus or streetcar with real-time vehicle tracking.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |