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Planet Earth

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Latest Activity: Jul 14, 2015

Our Universe, and Planet Earth

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Started by Jacqueline Keller. Last reply by Jacqueline Keller Jul 16, 2012.

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Comment by Harold Davis on July 14, 2015 at 2:43pm

New Horizons reaches Pluto

The NASA New Horizons spacecraft had its closest encounter with Pluto on Tuesday after a nine-a-half-year journey to the dwarf planet. Watch NASA's live coverage here.

Comment by Harold Davis on June 29, 2015 at 7:55pm

Major New Cosmic Simulation: Why it's Significant


Scientists have created an important new simulation of cosmic evolution. It takes place in a virtual cube 350 million light-years squared, and spans a time period from 12 million years after the Big Bang to the present day, or around 13 billion years' worth of cosmic evolution.

The project, called Illustris, encompasses over 12 billion data points to track the rise and evolution of some 50,000 galaxies. The simulation used a total of 8,000 processors, the equivalent of 2,000 years of processing time on a standard desktop computer. The run created half-petabyte of information.

The end result is a model that not only recreates the emergence of stars and galaxies, but the influence of dark matter and the spread of heavy metals throughout the universe.

Comment by Harold Davis on June 29, 2015 at 7:45pm

The Cosmic Web, or: What does the universe look like at a VERY large scale?

The Millennium Simulation featured in this clip was run in 2005 by the Virgo Consortium, an international group of astrophysicists from Germany, the United Kingdom, Canada, Japan and the United States. A virtual cube of 2 billion light years on a side was "filled" with 10 billion "particles" whose evolution was computed using the physical laws expected to hold in the currently known cosmologies. The initial distribution of matter, that resembled the conditions present when the cosmic microwave background radiation was emitted (about 379,000 years after the universe began) was allowed to evolve, and the formation of galaxies and black holes in the simulation were recorded. After all the computing work was done (28 days, at a rate of 200 billion calculations per second) 20 million galaxies were formed in the initial space. These galaxies and the dark matter around them formed web-like structures that resemble the shapes observed by the most recent data available in cosmic surveys, such as the Sloan Digital Sky Survey. Also very importantly: the simulation provided support for our current "standard model" of cosmology, the so called: Lambda Cold Dark Matter Model.

Comment by Harold Davis on June 1, 2015 at 6:07pm

Earth In 2050 - HD

Comment by Harold Davis on May 11, 2015 at 1:38pm

The End of the Universe-NatGeo HD

The ultimate fate of the Universe is a topic in physical cosmology. Many possible fates are predicted by rival scientific hypotheses, including futures of both finite and infinite duration.

Once the notion that the Universe started with a rapid inflation nicknamed the Big Bang became accepted by the majority of scientists,the ultimate fate of the Universe became a valid cosmological question, one depending upon the physical properties of the mass/energy in the Universe, its average density, and the rate of expansion.

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Comment by Harold Davis on April 30, 2015 at 1:32pm

Science Documentary / Before the Big Bang

Comment by Harold Davis on April 26, 2015 at 6:29pm

Earth From Space HD 1080p Nova

The groundbreaking two-hour special that reveals a spectacular new space-based vision of our planet. Produced in extensive consultation with NASA scientists, NOVA takes data from earth-observing satellites and transforms it into dazzling visual sequences, each one exposing the intricate and surprising web of forces that sustains life on earth.

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Comment by Harold Davis on February 10, 2015 at 5:15pm

A Science Odyssey: Mysteries of the Universe - Documentary

Comment by Harold Davis on December 24, 2014 at 1:35pm

Sir Martin Rees: Earth in its final century?

http://www.ted.com In a taut soliloquy that takes us from the origins of the universe to the last days of a dying sun 6 billion years later, renowned cosmologist Sir Martin Rees explains why the 21st century is a pivotal moment in the history of humanity: the first time in history when we can materially change ourselves and our planet. Stunning imagery of cosmological wonders show us the universe as we know it now. Speaking as "a concerned member of the human race," Rees harkens to the wisdom of Einstein, calling for scientists to act as moral compasses, confronting the coming developments and ensuring our role in "the immense future."

Comment by Harold Davis on December 22, 2014 at 1:50pm

 The Story Of Earth And Life

The Earth might seem solid beneath our feet but five billion years ago there was no sign of the planet we call home. Instead there was only a new star and a cloud of dust in our solar system. Over millions of years, a series of violent changes led to the formation of our world and, eventually, the creation of life.

In this photorealistic CGI epic, see how a boiling ball of rock transformed into the blue planet we know today. Explore every aspect of our world; learn how water first arrived on Earth, discover the vital role oxygen played as life forms began to evolve, and find out how land mammals evolved into dinosaurs and other giant beasts, before becoming extinct 65 million years ago.

Cutting-edge imagery also reveals how humans first began to walk on two feet and looks into the future to see what may be in store for our home over the next five billion years.

 

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