Sentences with phrase «impact hypothesis»

So the giant impact hypothesis had a major problem.

Support for the single impact hypothesis has grown in recent years, supported by computer simulations of giant impacts.

The findings of the study are still, to an extent, speculative, as they are dependent on the giant impact hypothesis being true.

The Younger Dryas Impact Hypothesis rests heavily on the claim that there is a Younger Dryas boundary layer at 29 sites in the Americas and elsewhere that contains deposits of supposed extraterrestrial origin that date to a 300 - year span centered on 12,800 years ago.

The comet impact hypothesis could also explain the presence of magnetic anomalies near the swirls.

Second, Hancock's impact hypothesis comes from scientists who first proposed it in 2007 as an explanation for the North American megafaunal extinction around that time and has been the subject of vigorous scientific debate.

This in turn has re-raised the antipodal pair impact hypothesis, the idea that pairs of opposite hot spots may result from the impact of a large meteor.

This Giant Impact Hypothesis suggests that the outer layers of Earth and the object were flung into space and eventually formed the moon.

When Hartmann and his colleague Donald Davis presented the giant - impact hypothesis at a conference in 1974, they learned that a team of Harvard astronomers had come up with the same idea.

Most evidence for the extraterrestrial impact hypothesis, he says, was conjured up «out of thin air.»

«We still stand fully behind the [impact hypothesis], which is based on more than a confluence of dates,» Firestone says.

The study «pulls the rug out from under the contrived impact hypothesis quite nicely,» says Christian Koeberl, a geochemist at the University of Vienna.

Giant impact hypothesis struggles to explain similarity between Earth and moon's composition

I ppoint to the Younger Dryas Impact Hypothesis as an example of that.

In 2007, a diverse group of 26 researchers, led by nuclear chemist Richard Firestone of the Lawrence Berkeley National Laboratory in California, formally proposed what is known as the Younger Dryas impact hypothesis, in which one or more extraterrestrial bodies blew up over North America, leading to widespread wildfires and strewing sun - blocking dust and debris across the globe.

Over 30 years ago, scientists proposed a large asteroid impact to explain the disparate elevations of Mars» northern and southern hemispheres; the theory became known as the «single impact hypothesis.»

«This is one of the major challenges for this really beautiful giant impact hypothesis,» Perets added.

The giant impact hypothesis, which explains many observations, such as the large size of the Moon relative to Earth and the rotation rates of Earth and Moon, eventually became the leading hypothesis for the Moon's origin.

«So people decided to change the giant impact hypothesis,» Wang said.

The findings help iron out a big wrinkle in the giant impact hypothesis, the only idea about the moon's origin that hasn't been shot down yet, says Harvard University planetary scientist Sarah Stewart, who was not involved with the study.

«In my mind, the giant impact hypothesis is still standing.»

Now comes what some researchers consider the strongest attack yet on the Younger Dryas impact hypothesis.

Shermer's article is a shallow and tendentious treatment of a complex subject that does not take proper account of rebuttals to critical attacks on the Younger Dryas impact hypothesis, in which a comet strike more than 12,000 years ago caused the megafaunal extinction in North America, and misrepresents the state of the argument around my theory that this event wiped out an advanced human society as well.

«Our experiments bring additional evidence in favor of the giant impact hypothesis,» said Maylis Landeau, the lead author of the paper, who was a post-doctoral fellow in Johns Hopkins» Department of Earth and Planetary Sciences when the experiments were conducted.

The study also throws cold water on a second objection to the impact hypothesis: Scientists have thought that rock melted by the powerful strike would have simply filled in the basin and erased any record of its effects.

Although the impact hypothesis has been around for decades, it has been hotly contested.

Currently the leading theory of how the moon formed is the giant impact hypothesis, which proposes that an object the size of Mars slammed into the infant Earth 4.5 billion years ago and knocked off large, molten chunks.

One of the pillars and promoters of the Younger Dryas Impact Hypothesis is a leading light of science.

The giant impact hypothesis, which explains many observations, such as the large size of the moon relative to the Earth and the rotation rates of the Earth and moon, eventually became the leading hypothesis for the moon's origin.

An impact hypothesis is usefully contrasted to the impacts of a large volcanic eruption like Pinatubo in 1991.

According to the widely accepted «giant impact hypothesis,» proposed in the 1970s, the moon formed about 4.5 billion years ago when a Mars - sized planet slammed into early Earth.

«(Now) I am even more confident about the giant impact hypothesis.»

According to the widely accepted «giant impact hypothesis,» proposed in the 1970s, the moon is believed to have been formed about 4.5 billion years ago when a Mars - sized planet slammed into early Earth.

According to the prevalent theory for the moon's formation — the «giant - impact hypothesis» — the Earth's axis (the invisible line that runs through the planet and connects its two magnetic poles, around which the planet spins each day) used to run perpendicular to its orbit.