Intro+to+Astronomy+07-08

=WTBW 9/7/07=

How many stars are in the Universe?
=Astronomy=

In the beginning
=So what is up There…up there, down there, over there?=

Is there really a “Global Killer”
=//__A sound that was never heard__//=

It has since expanded from this hot dense state into the vast and much cooler cosmos we currently inhabit.
=WTBW 9/10/07=

What ancient civilizations contributed to modern astronomy?
=History of the Big Bang=

His proposal came after observing the red shift in distant nebulas by astronomers to a model of the universe based on relativity.
==Years later, Edwin Hubble found experimental evidence to help justify Lemaître's theory. He found that distant galaxies in every direction are going away from us with speeds proportional to their distance.== ==We can see remnants of this hot dense matter as the now very cold cosmic microwave background radiation (with high-powered telescopes) which still pervades the universe and is visible to microwave detectors as a uniform glow across the entire sky.==

=__Writing Outlines__=

=//__General Theory of Relativity__//=

Newton's gravity is only valid for bodies at rest or moving very slowly compared to the speed of light (usually not too restrictive an assumption!).
= = = = = = =**//__Relativity__//**=

Physicist John Wheeler put it well when he said, "Matter tells space how to curve, and space tells matter how to move."
==Originally, the theory was able to account for peculiarities in the orbit of Mercury and the bending of light by the Sun, both unexplained in Isaac Newton's theory of gravity. In recent years, the theory has passed a series of rigorous tests.==

=WTBW 9/17/07=

What is the distance between the Sun and Earth?
=//__The Universe__//=

=//__Space Distance__//=

= =