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Do We Really Need Dark Matter?

December 7, 2012

Want to stay on top of all the space news? Follow @universetoday on Twitter Hubble mosaic of massive galaxy cluster MACS J0717.5+3745, thought to be connected by a filament of dark matter. Credit: NASA, ESA, Harald Ebeling (University of Hawaii at Manoa) & Jean-Paul Kneib (LAM) Even though teams of scientists around the world are at [...]

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From Eternity to Here: The Amazing Origin of our Species (in 90 Seconds)

October 31, 2012

From the initial expansion of the Big Bang to the birth of the Moon, from the timid scampering of the first mammals to the rise — and fall — of countless civilizations, this fascinating new video by melodysheep (aka John D. Boswell) takes us on a breathless 90-second tour through human history — starting from [...]

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Astronomy Without A Telescope – Is Time Real?

June 12, 2010

Time is an illusion caused by the passage of history (Douglas Adams 1952-2001). The way that we deal with time is central to a major current schism in physics. Under classic Newtonian physics and also quantum mechanics – time is absolute, a universal metronome allowing you determine whether events occur simultaneously or in sequence. Under Einstein’s [...]

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4th Dimension

September 22, 2009

The 4th dimension in physics, or spacetime, is any mathematical model that combines space and time into a single contiuum. Spacetime is usually interpreted with space being three dimensional and time playing the role of a 4th dimension that is of a different sort than the spatial dimensions. According to certain Euclidean space perceptions, the [...]

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