Blogspot - florinickka.blogspot.com - All About the Universe
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The Geometry of the Universe 28 Mar 2011 | 12:02 am
Some Universe Wallpapers Astronomers sometimes say that an open universe has the geometry of a sphere, and a closed universe has the geometry of a saddle. What do they mean by that? The sphere and t...
The Fate of the Universe 27 Mar 2011 | 11:30 pm
Some Universe Wallpapers If the mass in the Universe is distributed densely enough, then the combined gravity of it eventually reverses the expansion and makes it collapse on itself. If the average ....
The Big Bang 27 Mar 2011 | 11:27 pm
Some Universe Wallpapers Astronomers have found a lot of evidence that says that the Universe that we know today started about 13.7 thousand million years ago in a so-called Big Bang, and that the Un...
Which World View is the Best One? 27 Mar 2011 | 11:21 pm
Some Universe Wallpapers Any geocentric world view is not by definition worse than any heliocentric world view. Ptolemy, Copernicus, and Tycho assumed motion along circles, and if you add a sufficien...
The World View of Tycho Brahe 27 Mar 2011 | 11:16 pm
Some Universe Wallpapers Tycho Brahe proposed a world view in which the Sun revolves around the Earth (i.e., geocentric), but all other planets revolve around the Sun (i.e., heliocentric). His wor...
The Geocentric World View 27 Mar 2011 | 10:33 pm
Some Universe Wallpapers The key assumption of the Geocentric Model was that the Earth was at rest in the center of the Universe and that all other celestial bodies revolved around the Earth. This mo...
How Many Stars and Galaxies are there in the Universe? 27 Mar 2011 | 10:27 pm
Some Universe Wallpapers It is very difficult to give a reasonable estimate for the total number of stars and galaxies in the Universe, because we cannot always draw a well-defined line between stars...
Rotation in the Universe 27 Mar 2011 | 10:22 pm
Some Universe Wallpapers All things that rotate clockwise also rotate counterclockwise, and vice versa: just look at it from the other side. For example, the Earth rotates counterclockwise if you loo...
The Size of the Universe 27 Mar 2011 | 10:20 pm
Some Universe Wallpapers You can define the size of the Universe in different ways, because the Universe has kept expanding since its formation. A light ray from the formation of the Universe that ha...
The Age of the Universe 27 Mar 2011 | 10:12 pm
Some Universe Wallpapers The best estimate we currently have for the age of the Universe is 13.7 thousand million years, plus or minus a few hundred million years. This estimate follows from very ac...
