As human thought has progressed through history, our thoughts in science have spanned many millennia and many subjects. ... In our human history, cosmology has often been parallel to developments in society; from the renaissance period until now, and therefore is an almost perfect subject to use for the purposes of this essay. ... In the case of history, the Greek thinkers can largely represent this stage. ... In the third stage of astronomy's history, astronomers finally moved away from their obsession with circles. ...

• Word Count: 3486
• Approx Pages: 14
• Has Bibliography

For many years time travel was the stuff of science fiction. This was all just part of the world's imagination until recently. Scientists now believe that the current laws of physics allow us to travel though time. They believe that we can now travel back to see our founding fathers sign the declara...

• Word Count: 2726
• Approx Pages: 11
• Grade Level: High School

For most of Earth's history, the universe only encompassed what was visible to the naked eye. ... Though the history of the term is interesting, the main reason is that no light can escape from inside a black hole: it has, in effect, disappeared from the visible universe. ... The masses of the cores of these galaxies range from one million to several billion times the mass of the Sun. ...

• Word Count: 3066
• Approx Pages: 12
• Has Bibliography