Saturday December 15, 2018
Home Uncategorized Flowing water...

Flowing water filled Gale Crater on Mars: Indian-origin scientist

0
//
Republish
Reprint

Washington: Around 3.3-3.8 billion years ago, a series of streams and lakes existed on the Red Planet, filling the Gale Crater with sediment deposited as layers that formed the foundation for the mountain named Mouth Sharp, an Indian-origin scientist has revealed.

According to Ashwin Vasavada, project scientist with NASA’s Mars Science Laboratory (MSL), the Red Planet appears to have had a more massive atmosphere billions of years ago than it does today, with an active hydrosphere capable of storing water in long-lived lakes.

The MSL team has concluded that this water helped to fill Gale Crater, Curiosity’s landing site.

“Observations from Curiosity rover suggest that a series of long-lived streams and lakes existed at some point in the past, delivering sediment that slowly built up the lower layers of Mount Sharp,” explained Vasavada.

Using Curiosity data, MSL scientists have pieced together an increasingly coherent and compelling story about the evolution of this region of Mars.

Before Curiosity landed on Mars, scientists proposed that Gale Crater had filled with layers of sediments.

Some hypotheses implied that the sediments accumulated from wind-blown dust and sand whereas others focused on the possibility that sediment layers were deposited in ancient streams and lakes.

The latest results indicate that these wetter scenarios were correct for the lower portions of Mount Sharp.

“During the traverse of Gale, we have noticed patterns in the geology where we saw evidence of ancient fast-moving streams with coarser gravel as well as places where streams appear to have emptied out into bodies of standing water,” Vasavada emphasised.

The prediction was that we should start seeing water-deposited, fine-grained rocks closer to Mount Sharp.

“Now that we have arrived, we are seeing finely laminated mud-stones in abundance. These silty layers in the strata are interpreted as ancient lake deposits,” he pointed out.

“These finely laminated mud-stones are very similar to those we see on Earth,” added Woody Fischer, professor of geobiology and coauthor of the paper.

The mud-stones indicates the presence of bodies of standing water in the form of lakes that remained for long periods of time, possibly repeatedly expanding and contracting during hundreds to millions of years.

These lakes deposited the sediment that eventually formed the lower portion of the mountain.

A lingering question surrounds the original source of the water that carried sediment into the crater.

For flowing water to have existed on the surface, Mars must have had a thicker atmosphere and warmer climate.

Curiosity has been exploring Gale Crater since August 2012.

In mid-September 2014, the rover reached the foothills of Mount Sharp. Curiosity has been exploring the base of the mountain since then.

The new findings were published in the journal Science.

(IANS)

Click here for reuse options!
Copyright 2015 NewsGram

Next Story

NASA Photographs Mars InSight Lander From Space

The spacecraft will operate on the surface for one Martian year, plus 40 Martian days, or sols, until November 24, 2020

0
NASA, Hubble, Keplar, asteroids
NASA Photographs Mars InSight Lander From Space. Flickr

NASA has pinpointed the exact landing location of its newly launched InSight lander, using a powerful camera onboard another of the agency’s spacecraft, hovering around the Red Planet.

On November 26, InSight landed within a 130 km ellipse at Elysium Planitia on Mars. However, there was no way to determine exactly where it touched down within this region.

The HiRISE (which stands for High Resolution Imaging Science Experiment) aboard Mars Reconnaissance Orbiter (MRO) spotted Martian landscape and ground around the lander on Thursday, NASA said in a statement.

It released three new features on the Martian landscape, which appear to be teal. However, it is not their actual colour, but light reflected off their surfaces caused the colour to be saturated.

“The ground around the lander appears dark, having been blasted by its retro-rockets during descent. Look carefully for a butterfly shape, and you can make out the lander’s solar panels on either side,” NASA said.

HiRISE also spotted the lander’s heat shield and parachute, on December 6 and again on December 11, NASA said.

InSight, Mars, NASA, Martian Wind
InSight will study the interior of Mars, and will explore valuable science as NASA prepares to send astronauts to the Moon and later to Mars. VOA

They are within 1,000 feet (several hundred meters) of one another on Elysium Planitia, the flat lava plain selected as InSight’s landing location.

Meanwhile, the InSight lander also took a first selfie using the spacecraft’s robotic arm on December 6.

It snapped a mosaic made up of 11 images, which includes the lander’s solar panel and its entire deck, including its science instruments, weather sensor booms and UHF antenna.

Also Read- Face Mask of Kim Jong-un Stirs Controversy

The lander also sent another set of mosaic composed of 52 individual photos, showcasing the “workspace” — the approximately 14-by-7-foot (4-by-2-metre) crescent of terrain directly in front of the spacecraft, NASA noted.

InSight will study the interior of Mars, and will explore valuable science as NASA prepares to send astronauts to the Moon and later to Mars.

The spacecraft will operate on the surface for one Martian year, plus 40 Martian days, or sols, until November 24, 2020. (IANS)