The Big Bang Theory
What is the Big Bang Theory?
The Universe began from a hot, dense point and has been expanding.
What are 3 properties of stars?
Color, temperature, size, brightness, and composition.
What is the 1st stage in a star’s life?
A nebula.
What are the 4 planets closest to the Sun?
Mercury, Venus, Earth, Mars (inner planets).
Which waves have the longest wavelength?
Radio waves.
How is the Universe changing?
It is expanding.
How does star color relate to temperature?
Blue = hotter, red = cooler.
Our Sun is currently in this stage of its life cycle.
Main sequence.
What are the 4 planets farthest from the Sun?
Jupiter, Saturn, Uranus, Neptune (Jovian/outer planets).
What are the 4 parts of a transverse wave?
Crest, trough, wavelength, amplitude.
What is a light year?
The distance light travels in one year.
What 2 properties does a star’s spectrum tell us?
Its composition and temperature.
The term for how bright a star is.
Luminosity.
Why outer planets have longer years than inner planets.
They are farther from the Sun and take longer to orbit.
The force that causes tides on Earth.
Gravity from the Moon (and Sun).
What is red-shift?
When a star/galaxy is moving away from us.
How old is the Sun?
About 4.6 billion years old.
The dramatic explosion that creates heavy elements in the universe.
Supernova.
Small rocky objects that eventually form planets.
Planetesimals.
The type of eclipse where Earth blocks sunlight from reaching the Moon.
Lunar eclipse.
What is blue-shift?
When a star/galaxy is moving toward us.
What size star is our Sun?
An average (medium-sized) star.
The three galaxy types.
Spiral, elliptical, and irregular.
The process/theory that describes how the solar system formed from a cloud of gas and dust.
Nebular Theory.
The 2 shadows created during an eclipse.
Umbra and penumbra.