Science Semester 2 Notes

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Outline the Big Bang Theory:

Dominant Scientific

theory about the origin of the universe

What does origin

mean? Something coming into being

What must a theory

have to be accepted? It has to be proven

by evidence

Big Bang Flow Chart

Before: 10 Billion years ago. Hot, dense ball of radiation and sub-atomic

particles VERY HOT

The Bang: An explosion took place

and the matter expanded. As it expanded it cooled and electrons,

protons and neutrons formed. On further expansion and further cooling small

gaseous atoms like hydrogen and helium formed, then larger ones.

Forming of stars after the

Big Bang: The matter thrown out by the Big

Bang was denser in some places that others. In these senser paces, gravity

squeezed particles of matter together and formed galaxies containing stars.

The Universe today is made up of millions of galaxies like

these, moving further apart through space (still expanding).

Describe some difficulties telescopes have in obtaining information

about the universe.

Describe some difficulties telescopes have in obtaining information

about the universe.

Describe some difficulties telescopes have in obtaining information

about the universe.

Some problems that telescopes have is the atmosphere it poses a problem due to the fact that it distorts images

Star are also very far away so telescopes need to be really big to reach the star and get good pictures.

To get closer to stars and into space is very expensive

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