astrogeology   33

Did a Huge Impact Lead to the Cambrian Explosion?
In 1975, George Williams of the University of Adelaide proposed that in the Precambrian our Earth may have had a much higher tilt (about 54 degrees) than its present configuration (23.5 degrees). That high tilt could have been produced by the major impact that created our Moon 4 billion years ago. According to Dr. Young, another large impact 570 million years ago could account for the drastic reduction in tilt to today's position.
Snowball_Earth  geology  bolide_impacts  Earth  asteroids  astrogeology  history_of_life  astrobiology  planetary_formation 
october 2013 by celestius
U.S. Geological Survey (USGS)
As an unbiased, multi-disciplinary science organization that focuses on biology, geography, geology, geospatial information, and water, we are dedicated to the timely, relevant, and impartial study of the landscape, our natural resources, and the natural hazards that threaten us. Not just maps, anymore. From the Department of the Interior.
government_resources  federal  united_states  international  interior_dept  USGS  maps  GIS  geology  geography  environment  astrogeology  science 
august 2010 by sppl
JPL.NASA.GOV: Feature Stories
Saturn's moon Titan may have dunes composed of accumulations of tiny hydrocarbon particles.
hydrocarbons  Titan  moons  astronomy  astrogeology  planets  science  discoveries 
may 2008 by angusm

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