Sentences with phrase «by asteroids many»

Finally, on the Moon all structures have to be placed inside energy shields which prevent them from being destroyed by asteroids or terrorist bombardments.

Sadly your precious satellites can get wiped out by asteroids and often have a habit of firing at you as well.

It's catching the murderer in the mystery, taking down the drug cartel in a thriller, finding the secret talisman in the fantasy, saving planet Zignog from obliteration by asteroids in the science fiction novel, etc..

A stark reminder of the risk posed by asteroids and meteors came in 2013, when the 66 - foot - wide Chelyabinsk meteor fell over Russia's southern Ural region.

Earth has been hit by asteroids many times in its past.

This suggests that the biggest impact craters formed very early in Mars» history, and that later pummeling by asteroids mostly dented and dinged the surface.

«This report is a reasonable step forward in trying to understand and come to grips with the hazards posed by asteroids and comet impactors,» said geophysicist Jay Melosh, a distinguished professor in the Department of Earth, Atmospheric and Planetary Sciences at Purdue University in Lafayette, Indiana.

They attributed this to the glow of dust created by asteroids or comets that were gravitationally ripped apart when they wandered too close to the dead star.

Around 4 billion years ago, Earth was an inhospitable place, devoid of oxygen, bursting with volcanic eruptions, and bombarded by asteroids, with no signs of life in even the simplest forms.

Pelting by asteroids has left Callisto with the most heavily cratered surface of any moon.

Trinks, then a physicist at the Technical University of Hamburg - Harburg in Germany, had come to Nordaustland — far north of the Arctic Circle — to peer 4 billion years back in time to an era shortly after the end of the bombardment of Earth by asteroids.

Such elements are normally captured in the metallic cores of rocky worlds, and their existence hinted that Mars had been pelted by asteroids throughout its early history.

However, the Rosina mass spectrometer aboard Rosetta found that the ratio of deuterium to hydrogen in the comet is far greater than that found on Earth, adding to the growing body of evidence that the water on Earth was delivered not by comets, as previously thought, but by asteroids.

Russia's moon exploration program sees potential for minerals delivered by asteroid impact.

It might be pulverized by an asteroid at any time; we might accidentally blow it up or trash it beyond repair.

Humanity - the greatest destroyers the planet has seen since it got its ass royaly kicked by an asteroid 68 million years ago.

It is certain that the world will end sometime, either by our sun dying or the earth being struck by an asteroid or the moon leaving earth orbit or dozens of other possible catastrophies.

In their computer simulations, an impact by an asteroid at least 1,200 kilometers (745 miles) across was needed to deposit enough of the elements.

Johns Hopkins Applied Physics Laboratory in Laurel, Maryland: «Planetary Object Geophysical Observer (POGO),» a secondary payload that is a hopper to be dropped on the asteroid surface by the Asteroid Retrieval Vehicle to measure elemental composition of asteroid regolith at multiple locations.

Even the group of cephalopods, the so - called ammonites, was not annihilated by the asteroid strike at the end of the Cretaceous Period.

That's because they may have been created by an exploding star and delivered to Earth by an asteroid billions of years ago.

Some scientists suspect that nitrogen gas existed on Mars, but was blasted away by asteroid impacts billions of years ago.

One series of planet sculptures was inspired by an asteroid project they created for a friend, and each planetoid is handmade and one - of - a-kind.

One middle - aged star, known as HD 69830, appears to be surrounded by an asteroid belt that is 25 times as dense as the one in our solar system, possibly the remnants of a rocky planet that never formed.

Do you lie awake at night wondering what would happen if we earthlings were devastated by an asteroid or a plague?

«We're inside of a big hole in the ground — a crater created by an asteroid 4 billion years ago — and for some reason there's a giant mountain in the middle,» Bell says.

By the 1990s, death by asteroid impact was all the rage.

Many scientists believe the extinction was caused by an asteroid impact; some think regional volcanism was to blame, and others suspect it was due to a combination of the two.

Chances that life on Earth will be blighted by an asteroid strike are only half as high as previously assumed, according to a report in tomorrow's Nature.

«It may give us clues to the formation of Earth's moon and the moons of the other planets, and the role played by asteroid impacts in shaping the terrestrial [rocky] planets,» says Alexander Zakharov of the Moscow - based Space Research Institute and chief scientist for Fobos - Grunt.

About 1,100 miles across and nearly five miles deep, it was formed about 3.5 billion years ago by an asteroid impact.

In the new study, Kunk and Izett dated sanidine from the zone which was melted by the asteroid.

The eruptions that created the flow released enough toxic gas to off T. rex and company, and may have been triggered by the asteroid that smacked into the other side of the planet at roughly the same time.

But until now, whether the disparity was caused by an asteroid impact or volcanic action on the surface has been in dispute.

Almost a billion years later, a large impact by another asteroid melted some crust that promptly froze to form new crust, including a chunk that became Allan Hills A81001.

Earth is struck by an asteroid 60 meters (more than 190 feet) wide approximately once every 1500 years, whereas an asteroid 400 meters (more than 1,300 feet) across is likely to strike the planet every 100,000 years, according to Rumpf.

81 Tut Jewel Formed By Asteroid Impact The central jewel in King Tutankhamen's pectoral gear may have been literally out of this world...

The heat generated by an asteroid accounted for nearly 30 percent of lives lost, according to the study.

If that idea is correct, then it implies that the moon's water is mostly ancient — contrary to scientists who have argued that water was delivered more recently by asteroid impacts or even produced by a hail of protons known as the solar wind.

And because the first dust clouds would have formed with the star nearly 100 million years ago, Chen and Jura argue that «this disk must be continually replenished by asteroid collisions.»

Another possible scenario, though seen in only about 2 percent of the team's new simulations, is that Mars formed more than twice as far from the sun as its present - day orbit in the region currently inhabited by the asteroid belt.

Scripps graduate student Elizabeth Sibert and Professor Richard Norris analyzed the microscopic teeth of fishes found in sediment cores around the world and found that the abundance of ray - finned fish teeth began to explode in the aftermath of the mass die - off of species, which was triggered by an asteroid strike in the Yucatan Peninsula.

New research, led by the University of Southampton, has questioned the role played by ocean acidification, produced by the asteroid impact that killed the dinosaurs, in the extinction of ammonites and other planktonic calcifiers 66 million years ago.

Giant planet interiors are inaccessible to direct study from above, but oscillations excited by asteroid and comet impact can generate waves that are potentially observable.

The research contradicts other suggestions that the large valley networks on the red planet were the result of short - lived catastrophic flooding, lasting just hundreds to a few thousand years and perhaps triggered by asteroid impacts.

This encounter with TC4 is being used by asteroid trackers around the world to test their ability to operate as a coordinated international asteroid warning network.

And recent discoveries even suggest that we may occasionally be visited by asteroid - like objects coming in from interstellar space.

Therefore, most of the gold that is present today in the Earth's crust and mantle is thought to have been delivered to Earth later, by asteroid impacts during the late heavy bombardment, about 4 billion years ago.

For one thing, it's still possible for Earth to be hit by another asteroid!

The bright areas around craters appear to be composed of pristine and possibly primodial material uncovered and ejected by asteroid collisions that may extend for 19 miles (30 kilometers) or more.