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Originally posted by 46ACE
"plenty of very smart people disagree: here's one explaining "4 dimensions"
edit on 18-9-2012 by 46ACE because: (no reason given)
Originally posted by Agarta
As I understand it we live in the 4th dimension. One must be one higher to perceive the one before it. Ist = plane, 2nd = height and width, 3rd = Height, width, and depth. 4th = height, Width Depth and Time. As we live in the 4th we can not perceive the 4th to its entirety nor can we understand the 5th. That's how I understand it anyway.
Edit to add: In contrast because we live in the fourth we can not understand the complexities of existing in the 3rd dimension or lower due to having the understandings of the 4th.edit on 18-9-2012 by Agarta because: (no reason given)
Sagan's contributions were central to the discovery of the high surface temperatures of the planet Venus. In the early 1960s no one knew for certain the basic conditions of that planet's surface, and Sagan listed the possibilities in a report later depicted for popularization in a Time-Life book, Planets. His own view was that Venus was dry and very hot as opposed to the balmy paradise others had imagined. He had investigated radio emissions from Venus and concluded that there was a surface temperature of 500 °C (900 °F). As a visiting scientist to NASA's Jet Propulsion Laboratory, he contributed to the first Mariner missions to Venus, working on the design and management of the project. Mariner 2 confirmed his conclusions on the surface conditions of Venus in 1962.
Sagan was among the first to hypothesize that Saturn's moon Titan might possess oceans of liquid compounds on its surface and that Jupiter's moon Europa might possess subsurface oceans of water. This would make Europa potentially habitable. Europa's subsurface ocean of water was later indirectly confirmed by the spacecraft Galileo. The mystery of Titan's reddish haze was also solved with Sagan's help. The reddish haze was revealed to be due to complex organic molecules constantly raining down onto Titan's surface.
He further contributed insights regarding the atmospheres of Venus and Jupiter as well as seasonal changes on Mars. He also perceived global warming as a growing, man-made danger and likened it to the natural development of Venus into a hot, life-hostile planet through a kind of runaway greenhouse effect. Sagan and his Cornell colleague Edwin Ernest Salpeter speculated about life in Jupiter's clouds, given the planet's dense atmospheric composition rich in organic molecules. He studied the observed color variations on Mars' surface and concluded that they were not seasonal or vegetational changes as most believed but shifts in surface dust caused by windstorms.
Sagan is best known, however, for his research on the possibilities of extraterrestrial life, including experimental demonstration of the production of amino acids from basic chemicals by radiation.
He is also the 1994 recipient of the Public Welfare Medal, the highest award of the National Academy of Sciences for "distinguished contributions in the application of science to the public welfare". He was denied membership in the Academy, reportedly because his media activities made him unpopular with many other scientists..
Originally posted by FreedomCommander
Time does not have a factor, movement does not have a factor.
So the only thing that I can say about 4th dimension is that it's an idea. Emphasis on idea, since this Carl Sagan guy that was mention said "imagine that there is a 4th physical dimension."