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Week 2 Lesson 3

The Universe

QuestionAnswer
Universe all of the matter, energy and space that have existed since the beginning of time. The universe contains stars, planets, comets, asteroids, satellites, gases and dust. "
Big Bang Theory A cosmological theory that the universe originated approximately 20 billion years ago from the violent explosion.
Red Shift If a star is moving AWAY from the observer, the spectral lines shift toward the RED wavelength of light
Deuterium is an isotope of the element Hydrogen.  Since it is present in the Universe, scientists use it as proof for the Big Bang Theory
After Glow commonly known as the cosmic background radiation – is the left-over heat from the fireball of the big bang in which the Universe was born 13.7 billion years ago.
Nebula cloud of dust and gases in space
Nuclear Fusion converts 2 hydrogen atoms into a helium atom, and left over energy is given off in the form of light and heat. This is why the star shines
Life Cycle of a Star Stars are born in nebulae. Huge clouds of dust and gas collapse under gravitational forces, forming protostars. These young stars undergo further collapse, forming main sequence stars.
Created by: jandre04
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