Nebula Theory
Small Stars
Large Stars
More Stars
The Big Bang
100
Nebulae are mostly made of this gas
What is hydrogen?
100
When a small star runs out of hydrogen to burn, the small center left over is called this
What is a white dwarf?
100
Large stars explode when they die. We call the explosion a ________.
What is Supernova
100
Stars are in balance, which we call this
What is (hydrostatic) equilibrium?
100
The big bang happened this long ago
What is 13.7 billion years ago?
200
A nebula is a cloud of gas and ________
What is dust?
200
Small stars generally live ___________ than big stars
What is longer?
200
Large stars can fuse elements all the way up to Fe, which is the chemical symbol for this element
What is Iron?
200
A nebula is pulled together by this force to eventually become a star
What is gravity?
200
After the big bang only these two elements existed
What is hydrogen and helium?
300
Gravity causes so much pressure in the center of a star that this happens
What is nuclear fusion?
300
The least hot stars are grouped in this letter
What is M?
300
The largest stars die and become these powerful vacuum like objects.
What are black holes?
300
Balancing the pressure of gravity pushing in is this force pushing out
What is nuclear fusion?
300
We know the big bang happened because of the existence of this all over the universe
What is cosmic background radiation?
400
When a nebula starts spinning it flattens into this shape
What is a disk?
400
Small stars are usually this color because they are not very hot
What is red?
400
Sometimes a supernova fuses the protons and electrons together in a star and this is left over
What is a neutron star?
400
When a small star runs out of hydrogen fuel to burn, it expands and becomes this
What is a red giant?
400
We also know the Big Bang occured because everything in the universe is moving _________ from us
What is away?
500
Plantesimals combine to form these
What are planets?
500
Small stars are also called this
What are dwarfs?
500
The largest stars generally burn this color
What is blue?
500
When a large star runs out of fuel to burn, it expands and becomes this
What is a supergiant?
500
When a distant object is moving away from us, we can detect its ______ shift
What is red?
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