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UFO SCEPTICISME  » ACTUALITÉS SCIENTIFIQUES ET PHOTOS DE L'ESPACE » Jung tomlingsung assistera a deux conférences NASA

Jung tomlingsung assistera a deux conférences NASA

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Dr. John Valley and a team of scientists from a NASA Astrobiology Institute funded project at the University of Wisconsin-Madison using two different age-determining techniques have shown that a tiny zircon crystal found on a sheep ranch in western Australia is the oldest known piece of our planet, dating to 4.4 billion years ago. In a recent paper published in the journal Nature Geoscience, Valley and his team said the discovery indicates that Earth's crust formed relatively soon after the planet coalesced, leaving the zircon as one of the tiny surviving remnants. The results of their work shows that the Earth was not as harsh as scientists had previously thought.

Dr. John W. Valley - John Valley is the Charles R. Van Hise Professor at the University of Wisconsin-Madison's Department of Geoscience. He is also an investigator for the NASA Astrobiology Institute's (NAI) Wisconsin Astrobiology Research Consortium (WARC) where he is tasked with determining the surface conditions of the ancient Earth (up to 4.4. b.y. ago) through studies of the oldest terrestrial zircons using light stable isotopes such as Li and O; determining the genesis and biogenicity of proposed Archean microfossils and host cherts through O, C, S, and Si isotope studies; developing new insights into the fine-scale isotopic variability of ancient samples using the new Wisc-SIMS ion microprobe facility. His research interests span many fields in Earth Science. One interest concerns the igneous and metamorphic evolution of the crust during orogenesis with emphasis on the role of magmas, fluids, and thermobarometry. Another relates to sediments, diagenesis, and the rock record of past climate.


Delivering JWST Science, from Exoplanets to First Light: The Near-Infrared Imager and Slitless Spectrograph (NIRISS)

The Near-Infrared Imager and Slitless Spectrograph (NIRISS) is the scientific part of Canada’s hardware contribution to the James Webb Space Telescope (JWST). Although it is the least complex of the four science instruments onboard JWST, NIRISS will provide several unique observational capabilities. These special observing modes will be described in the context of the exciting scientific problems they will be able to address, which range from searching for “first light” in the early universe to determining the atmospheric composition of planets around nearby stars. The status of NIRISS and preparations for the second cryogenic test campaign of the JWST instruments at NASA’s Goddard Space Flight Center will also be reviewed.

Alex Fullerton obtained his PhD in stellar astrophysics from the University of Toronto in 1990. After postdoctoral positions at the University of Delaware and the University Observatory in Munich, Germany, he moved to the Johns Hopkins University to become a support astronomer for the Far Ultraviolet Spectroscopic Explorer (FUSE) mission in 1997. He has been working on the development of the James Webb Space Telescope at the Space Telescope Science Institute (STScI) since 2004, and became the leader of the NIRISS Team in 2012.

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