Sentences with phrase «impact crater at»

Impact craters at many latitudes sometimes expose thin ice layers a foot or so beneath Mars» surface.132 «At polar latitudes, as much as 50 percent of the upper meter of soil may be [water] ice.»

Not exact matches

The study looked at smaller craters within the larger SPA basin made by impacts that happened millions of years after the giant impact that formed the basin.

In looking at NASA images of Mars a few years ago, Brown University geologist Peter Schultz noticed sets of strange bright streaks emanating from a few large - impact craters on the planet's surface.

Key to the basin's identification as a potential impact crater are the decrease in the strength of Earth's gravity over the site, indicating a large basin filled with younger low - density sediments, and a strong increase in the strength of Earth's magnetism at the site.

After almost three months of round - the - clock drilling, geologists have finished a 1.1 - mile borehole to the bottom of the United States» largest impact crater, a 53 - mile - wide depression at the mouth of the Chesapeake Bay.

Its charge was simple: Look for signs that Gale crater, a huge impact basin with a mountain at its center, might once have been habitable (for microbes, not...

At first glance, the swirls do not appear to be related to large impact craters or any other topography.

These «disaster species» colonized the harsh waters above the crater within hundreds of years of the impact, the researchers reported December 12 at a news conference at the American Geophysical Union's fall meeting.

Indeed, a paper by co-author John Sutherland — a chemist at the Medical Research Council Laboratory for Molecular Biology in Cambridge, U.K. — suggests that all the basic chemicals for life can be cooked up in a water - filled impact crater.

At the same time, the impact would have plastered preexisting river and swamp deposits onto the flanks of the impact crater, where they would later be imaged as the chaotic deposits in our acoustic - echo profiles.

In this instance, researchers have been able to use new imaging techniques to measure the atomic nanostructure of ancient crystals at impact locations, using the 150 - kilometre - wide crater at Sudbury as a test site.

«I don't believe the evidence of a crater off Madagascar, and the impetus is on Abbott to prove it,» says Jay Melosh, an impact expert at the University of Arizona and an outspoken critic of the theory.

The Chicxulub crater, the remnant of the impact discovered buried under Mexico's Yucatan peninsula a decade ago, is at least 180 kilometres across, and dates back to the Cretaceous - Tertiary (K / T) boundary, a geological layer of material laid...

At its base, scientists expect to find a hodgepodge of chunks of bedrock blasted up by the impact and once - molten rock that fell back into the crater in the minutes after impact.

But rather than a monotonously uniform surface homogenized by impact cratering over the eons, the first up - close look at the asteroid reveals a full palette of mineral «colors» (mapped here in false color reflecting the wide range of rock compositions).

BEYOND its polar lakes, Saturn's moon Titan has vast expanses of hydrocarbon wetlands, according to a new look at the chilly world's impact craters.

The giant crater at the centre of the image, called Herschel, was probably gouged out by an enormous asteroid impact.

At first glance it resembles circular features seen elsewhere in the solar system, from impact craters to volcanoes.

You can scoop up bits of stishovite at the scene of meteorite impacts, such as a 50,000 - year - old meteor crater in Arizona that measures about 3 / 4 - mile across and about 570 feet deep.

«By comparing the measured craters to the number and spatial distribution of large impact basins on Mercury, we found that they started to accumulate at about the same time, suggesting that the resetting of Mercury's surface was global and likely due to volcanism,» said lead author Dr. Simone Marchi, who has a joint appointment between two of NASA's Lunar Science Institutes, one at the SwRI in Boulder and another at the Lunar and Planetary Institute in Houston.

New research suggests that water came from melting snow and ice present at the time of the crater - forming impact.

The spacecraft mapped Martian terrain with a laser altimeter, detected traces of magnetic fields with its magnetometer, and mapped at least 20 new impact craters between the time it started operations and the time it fell silent.

In the summer of 2014, with the support of the Irish Reseach Council (IRC) and Science Foundation Ireland (SFI), the team collected thousands of zircons from the Sudbury impact crater, Ontario, Canada - the best preserved large impact crater on Earth and the planet's second oldest confirmed crater at almost two billion years old.

«The red arcs must be geologically young because they cut across older features like impact craters, but we don't know their age in years,» Paul Helfenstein, a Cassini imaging scientist at Cornell University, Ithaca, in New York, said in the statement.

Studying the number of impact craters to calculate the age of these regions on the surface, scientists estimated that the planet's magnetic field is very ancient — at least 3.7 billion to 3.9 billion years old.

As five impact craters on Mercury receive names, NASA's MESSENGER spacecraft is about to create another, since it has run out of propellant and is predicted to impact on the surface of the planet at 8:26 pm BST today.

But the fact that impact melt isn't always homogenous changes the way geologists look at lunar impact craters.

«At the time, the media reported that it was probably a meteorite impact crater», Lenaerts says.

For instance, After the discovery of the Chicxulub crater at the tip of Mexico's Yucatan Peninsula, scientists began developing numerical models to understand the sequence of events during the impact and their consequences.

But Gulick, part of a 2016 drilling project to explore the asteroid's crater, said there was little evidence for sufficient amounts of organic matter at the Chicxulub impact site.

John Spencer, like Stern a scientist at the Southwest Research Institute, called it «just astonishing» that the first close - up picture of Pluto didn't have a single impact crater.

Study of the images indicated that the crater was probably the result of a shallow impact with a comet or asteroid, at an angle of approximately 45 degrees.

At Shanghai's Power Station of Art, the impact of an unknown object has created a vast crater in a barren moonscape.

Where is the severe ice age that should have followed the Dinosaur - killer meteor impacts at Chicxulub crater, Silverpit crater, and Boltysh crater about 65 million years ago?

Guest shoot - down by David Middleton Preface In my previous two posts on uniformitarian impact craters, we examined the pitfalls of drawing cartoons on Google Earth images without ever looking at the geology and how the Carolina Bays are as antithetical to impact features as any dents in the ground possibly could be.