PRESENTATION OUTLINE
Law vs. Theory
Scientific laws and theories are very similar, though there are differences. Scientific theories are explanations of an observed phenomenon. They summarize hypotheses that are supported with repeated testing. If enough evidence is collected, it he hypothesis becomes accepted as a valid explanation for a phenomenon.
Scientific laws are descriptions of an observed phenomenon. They originally start out as scientific theories, but enough information is collected to prove it is a law of science.
The Big Bang
The Big Bang is believed to be what created the universe, and there are many things that support the theory. For one, the universe had to have a beginning, as everything has. Another is, the galaxies seem to be moving away from us at great speeds. This supports the fact the universe is expanding. Also, in 1965, a thermal radiation was discovered by Arno Penzias and Robert Wilson. If the belief that the universe was extremely hot after the Big Bang, the thermal radiation would be proof. Finally, it's thought that helium and hydrogen are part of the origins of the Big Bang.
Steady-State Theory
The steady state theory is a belief that the universe is always expanding, while maintaining a constant average density. Matter is constantly being created to build new stars and galaxies, while at the same time, old ones become unobservable. A steady-state universe has no beginning or end, and from every point of view, the arrangement of the galaxies Nd the average density is the same. Galaxies of all ages are mixed together.
Nicolaus Copernicus
Copernicus was born on February 19, 1473. He studied mathematics and astronomy at the University of Karkow. During his time, most of the astronomers believed the theory of the Greek astronomer, Ptolomy. His theory was that the Earth was the center of the universe and was motionless. He believed everything revolved around Earth. Copernicus believed he was wrong. Between 1507 and 1515, he calculated the heliocentric astronomy. He had made every observation with his naked eye. He concluded, the Earth and all the planets revolved around the sun, while Earth rotated on an axis daily. Because of his discovery, Copernicus was named "the Father of modern astronomy".
