... 2000 February 26 . Impact: 65 Million Years Ago . ... Their sudden disappearance 65 million years ago, along with about 70 percent of all species then living on Earth, is known as the K-T event (Cretaceous-Tertiary Mass Extinction event). ... Regardless of the true cause of the K-T event, it is fortunate that such impacts are presently believed to happen only about once every 100 million years! ... About APOD | ...

Next: Results and Discussion Up: Evolution of Supernova Explosion Previous: - Dependence for the . In order to construct the - dependence for supernova explosions, we calculated separately the m ( z ) in the R band and N ( z ) taking the cosmological and evolutionary effects into account. ... where n(t) is the SN rate as a function of age of the galaxy, t(z) is the age of the galaxy as a function of its redshift, and is the density of galaxies in the Universe. ...

... Up: Science Data Pipelines . ... Jenness, T., Archibald, E. N., Economou, F., Jessop, N., Robson, E. I., Tilanus, R. P. J., & Holland, W. S. 2001, in ASP Conf. ... Tim Jenness . ... This paper describes the automated calibration and reduction scheme used to process the archive data with particular emphasis on the pointing observations. This is made possible by using the ORAC-DR data reduction pipeline, a flexible and extensible data reduction pipeline that is used on UKIRT and the JCMT. ...

... PALMA Numbers 1 to 11 Observations of positions of stars and planets May 1984 to May 1998 including Extinction and Meteorological data Copenhagen University Observatory Royal Greenwich Observatory Real Instituto y Observatorio de la Armada en San Fernando 1999 http://www.ast.cam.ac.uk/~dwe/SRF/cmc1-11/readme.txt Informations ... Hour of right ascension (alpha, h) 4. Minute of right ascension (alpha, m) 5. Second of right ascension (alpha, s) 6. Degree of declination (delta, deg) 7. ...

Your browser does not support script . Please send comments or suggestions to: gabrelle at apo . ARC 3.5m | Extinction data . [If you see this text, your browser doesn't support iframes. Click here to view it separately.] .

. A large body of scientific evidence now exists in support of the idea that a major asteroid or comet impact occurred 65 million years ago and led to the extinction of 75 percent of life on Earth, including the dinosaurs. Don Davis / NASA

A1459 2000-Jun-01 17:26:55 Technical Page Proposal Type: Large General Category: Astronomy Sub-Category: Spectroscopy Observation Category: Extragalactic Total Time Requested: 325 Hours Proposal Title: 2MASS Galaxies in the Zone of Avoidance ABSTRACT: The 2-Micron All Sky Survey (2MASS) has now nearly completed observations of the whole sky. ... These observations are complementary to other HI and optical redshifts being collected to form a complete sample of 2MASS galaxies to K=12.0. ...

Subject, Problems and Objects of Theoretical Astrophysics. ... Stellar Photospheres, Their Features. ... Physics of Continuous Radiation Absorption in Stellar Photospheres. ... Continuous Radiation Absorption in Stellar Photospheres of Various Spectral Classes. Solar Type Photospheres. ... Characterisics of Absorption Lines. ... Interstellar Absorption Lines, Their Features. ... Physical and Dynamic Features of Interstellar Medium, Which Follows from Observations of Interstellar Absorption Lines. ...

A team of scientists believes they have discovered a chain of impact craters in the central African country of Chad that suggests ancient Earth may have been hit by a large, fragmented comet or asteroid similar to the Shoemaker-Levy 9 comet that slammed into Jupiter in 1994. The craters were discovered in radar images of the Earth taken by the Spaceborne Imaging Radar C/X-band Synthetic Aperture Radar (SIR-C/X-SAR) that flew on the Space Shuttle Endeavour in April and October of 1994. ...

. Parent Directory . countdown.to.extinction . killing.is.my.business . looking_down_the_cross . loved_to_deth . mechanix . peace.sells.but.whos.buying . rust.in.peace . skull_beneath_the_skin . so.far.so.good.so.what . youthanasia

... Automated Spectral Classification Using Neural Networks E. F. Vieira Laboratorio de AstrofТРsica Espacial y FТРsica Fundamental P.O.Box 50727, 28080 Madrid, Spain, Email: efv@lae#.esa.es J. D. Ponz GSED/ESA, Villafranca P.O.Box 50727, 28080 Madrid, Spain, Email: jdp@vilspa.esa.es Abstract. We have explored two automated classification methods: supervised classification using Artificial Neural Networks (ANN) and unн supervised classification using Self Organized Maps (SOM). ...

... Milloins of years timescale . ... 500 million years ago (unclear) . ... Evidence from Fossil Record: 100-150 million year extinction periodicity ?? ... Climate Cycle ? ... Since the orbital period of the Sun around the center of the Galaxy is about 250 million years then every 100-150 million years the earth is in a spiral arm which is a region of high supernova density. ... Somewhere between 700 and 800 million years ago there was a 10 million year long period where the oceans were completely...

Astronotes Armagh Planetarium's Stellar Blog! ... Comets and Asteroids . ... Earth Satellites . ... Thankfully, throughout the human species? life span falling asteroids or large impacts have not killed anyone. However, around 65 million years ago an asteroid or comet about 10km (6 miles) wide caused global extinction for around 70% of all life when it crashed into the Earth. ... It makes sense now to link the Chicxulub impact crater with a large asteroid that impacted 65 million years ago. ...