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The Universe

The Universe is by definition everything that physically exists in space and time. It originated in the Big Bang 13.7 billion years ago. The radius of the Universe is at least 78 billion light years. That is the distance to the point from which a photon of light originated which is now reaching us after traveling for 13.7 billion years. However the Universe could be far larger. There is no limit to the speed at which space itself may expand, so the Universe may stretch far beyond the Hubble horizon expanding away from us faster than the speed of light. It is also conjectured that our Universe may be only one of 10500 other universes which may have totally different laws of nature and which are collectively called a multiverse.

  • Herschel and Planck Share Ride to Space Featured news Herschel and Planck Share Ride to Space Herschel and Planck Share Ride to Space

    PASADENA, Calif. (May 5, 2009) – Two missions to study the cosmos, Herschel and Planck, are scheduled to blast into space May 14 aboard the same Ariane 5 rocket from the Guiana... More »

  • Galactic particle accelerator located Featured news Galactic particle accelerator located Galactic particle accelerator located

    ETH, Zurich (Sep. 14, 2009) – An unprecedented measuring campaign has succeeded in precisely defining the place of origin of high-energy gamma radiation in the galaxy Messier... More »

  • Planck Featured article Planck Planck

    Planck is Europe's first mission to study the relic radiation from the Big Bang. Ever since the detection of small fluctuations in the temperature of this radiation, announced in... More »

  • Carl Sagan Featured video Carl Sagan "Pale Blue Dot"

    From the source: From the Carl Sagan's Pale Blue Dot. There are several different versions of "The Pale Blue Dot" on-line. The actual words were taken from Carl... More »

Recently Updated
Is Our Universe at Home Within a Larger Universe? Last Updated on 2010-03-29 00:00:00 BLOOMINGTON, Ind. (April 5, 2010) – Could our universe be located within the interior of a wormhole which itself is part of a black hole that lies within a much larger... More »
Astronomers: The end is nigher than we expected Last Updated on 2010-01-27 00:00:00 CANBERRA, AUSTRALIA (Jan. 26, 2010) – Cars run out of petrol, stars run out of fuel and galaxies collapse into black holes. As they do, the universe and everything in it is... More »
Carl Sagan Discusses the 4th Dimenion Last Updated on 2010-01-05 00:00:00 Carl Sagan talks about the 4th dimension and how it is possible to understand curved space time as used by Einstein in his general theory of relativity. More »
'Our Place in the Cosmos' Last Updated on 2009-12-07 20:30:34 "Our Place in the Cosmos", the third video from the Symphony of Science, was crafted using samples from Carl Sagan's Cosmos, Richard Dawkins' Genius of Charles Darwin... More »
'We Are All Connected' Last Updated on 2009-12-07 17:02:49 "We Are All Connected" was made from sampling Carl Sagan's Cosmos, The History Channel's Universe series, Richard Feynman's 1983 interviews, Neil deGrasse Tyson's... More »