Extraterrestrial Helium in Seafloor Sediments ...

Farley, Kenneth A. (2001) Extraterrestrial Helium in Seafloor Sediments: Identification, Characteristics, and Accretion Rate Over Geologic Time. In: Accretion of Extraterrestrial Matter Throughout Earth's History. Kluwer Academic/Plenum Publishers, New York, pp. 179-204.


Extraterrestrial atmosphere - Wikipedia

The study of extraterrestrial atmospheres is an active field of research, both as an aspect of astronomy and to gain insight into Earth's atmosphere. In addition to Earth, many of the other astronomical objects in the Solar System have atmospheres .


Evidence for an extraterrestrial impact 12,900 years ago ...

Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling R. B. Firestone a, b ... fullerenes with ET helium, ... (2001…


Is There An Alien Fusion Reactor On The Moon? Watch ...

Online sources referencing the theory that a fusion reactor is located in the Aristarchus crater date back to 2001 and probably earlier. Some insist that the crater contains a massive helium-3 fusion reactor.


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Final Report on NASA Grant NAG5-6941: Continued Investigations of the Accretion History of Extraterrestrial Matter over Geologic Time June 30, 2001


A Short Duration of the Cretaceous-Tertiary Boundary Event ...

Cretaceous-Tertiary Boundary Event: Evidence from ... ago indicate a near-constant ßux of extraterrestrial helium-3, a tracer of the ... 1952 9 MARCH 2001 VOL 291 SCIENCE


Extraterrestrial Helium in Seafloor Sediments ...

Helium isotope systematics uniquely identify the extraterrestrial component, which is apparently hosted within magnetite and silicate grains. In some sediments 3 He is completely derived from this source, in others the extraterrestrial fraction can be computed from the measured 3 He/ 4 He ratio.


An Extraterrestrial Impact at the Permian-Triassic Boundary?

Becker et al . ([1][1]) presented geochemical evidence that suggests that the largest mass extinction in Earth history, at the Permian-Triassic boundary (PTB) 250 million years ago (Ma), coincided with an extraterrestrial impact comparable in size to the one that likely caused the end-Cretaceous


Helium-3 - Wikipedia

Helium-3 (He-3, also written as 3 He, see also helion) is a light, non-radioactive isotope of helium with two protons and one neutron (common helium having two protons and two neutrons). Its hypothetical existence was first proposed in 1934 by the Australian nuclear physicist Mark Oliphant while he was working at the University of Cambridge Cavendish Laboratory.


A Short Duration of the Cretaceous-Tertiary Boundary Event ...

Abstract. Analyses of marine carbonates through the interval 63.9 to 65.4 million years ago indicate a near-constant flux of extraterrestrial helium-3, a tracer of …


Impact event at the permian-triassic boundary: Evidence ...

The Permian-Triassic boundary (PTB) event, which occurred about 251.4 million years ago, is marked by the most severe mass extinction in the geologic record.


Extraterrestrial Helium in Seafloor Sediments ...

Almost 40 years after the discovery of extraterrestrial helium in seafloor sediments, renewed attention is being focused on using helium as a proxy for the sedimentary abundance of ...


Extraterrestrial helium trapped in fullerenes in the ...

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Helium plasma | Physics Forums

Jul 07, 2012· Most extraterrestrial helium is found in a plasma state, with properties quite different from those of atomic helium. In a plasma, helium's electrons are not bound to its nucleus, resulting in very high electrical conductivity, even when the gas is only partially ionized.


Absence of extraterrestrial 3He in Permian–Triassic age ...

Helium concentration and isotopic composition were measured in a suite of samples across the Permian–Triassic boundary at Opal Creek, Canada, to determine whether high extraterrestrial helium concentrations are associated with a possible extinction-inducing impact event at this time.


Micrometeorites and extraterrestrial He in a ...

The time-integrated flux of extraterrestrial He measured in the ferroman- Helium isotopes ganese crust is a small fraction of that determined from Pacific Ocean sediments, implying that the crust Micrometeorites has trapped only a small fraction of the extraterrestrial dust that has fallen to Earth.


Apocalypse Then | Science Mission Directorate

Feb 22, 2001. Apocalypse Then ... Terrestrial helium is mostly helium-4 (two neutrons and two protons), while extraterrestrial helium is enriched with helium-3 (one neutron and two protons). "These things form in carbon stars. That's what's exciting about finding fullerenes as a tracer," Becker said. The extreme temperatures and gas pressures ...


Evidence for an extraterrestrial impact 12,900 years ago ...

Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling. R. B ... Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling ... Proceedings of the National Academy of Sciences Oct 2007, 104 ...


Earth and Planetary Science - Harvard University

flux proxies, such as extraterrestrial helium-3, yield dust flux records that are independent of the biases ... 2001) and the nutritional boon it brings to otherwise ... J.L. Middleton et al. / Earth and Planetary Science Letters 482 (2018) 12–22 13 Twentieth century records of …


An Extraterrestrial Impact at the Permian-Triassic Boundary?

We have found fullerenes with ET helium associated with extinction events in five locations at the 65-million-year-old Cretaceous-Tertiary boundary (KTB) and in two locations at the PTB (1, 2).


DEFINING OF THE INTENSITY OF SOLAR RADIATION ON …

Defining of the Intensity of Solar Radiation on Horizontal and Oblique Surfaces on Earth 79 December 20th (summer longest daylight on the south hemisphere, i.e., winter shortest daylight on the north hemisphere). During the spring and autumn equinox, on March 21st and September 22nd the declination angle is 0°. The declination value (δ) can be


No evidence of extraterrestrial noble metal and helium ...

1 No evidence of extraterrestrial noble metal and helium anomalies 2 at Marinoan glacial termination 3 Bernhard Peucker-Ehrenbrink a,*, Christine A. Waters a,b, Mark D. Kurz a and Paul F. Hoffman c 4 a Woods Hole Oceanographic Institution, Department of Marine Chemistry and Geochemistry, Woods 5 Hole, MA 02543, U.S.A. 6 b University of Texas at El Paso (UTEP), El …


Pubs.GISS: Becker et al. 2001: Impact event at the Permian ...

Fullerenes (C 60 to C 200) from sediments at the PTB contain trapped helium and argon with isotope ratios similar to the planretary component of carbonaceous chondrites. These data imply that an impact event (asteroidal or cometary) accompanied the extinction, as was the case for the Cretaceous-Tertiary extinction event about 65 million years ago.


Geotimes - April 2001: News Notes

Geochemistry P/T extinction explained. The search might be over to explain Earth's most severe mass extinction — the Permian-Triassic event that wiped out almost all life on Earth 250 million years ago.