This cloud in space is the birthplace for all stars.
What is a nebula?
100
A star's color gives an indication of this.
What is it's temperature?
100
These kinds of galaxies do not have a regular shape.
What is an irregular galaxy?
100
The universe contains many of these clusters of billions of stars, gas, and dust.
What is a galaxy?
100
These colored stars are the coolest stars.
What is red?
200
This process occurs in the core of stars.
What is nuclear fusion?
200
On the Hertzsprung Russell diagram, 90% of all stars fall into this area.
What is the Main Sequence?
200
Our galaxy is roughly 100,000 of these across.
What is a light year?
200
This theory states that the universe began with a massive explosion.
What is the Big Bang Theory?
200
Black holes or neutron stars form after this explosion of the outer gassy layers in a dying star occurs.
What is supernova?
300
This is the name for an early star.
What is a protostar?
300
This is the brightness of stars if they were a standard distance from Earth.
What is absolute magnitude?
300
This is believed to be at the center of our galaxy.
What is s black hole?
300
The universe is doing this and as a result galaxies are spreading further and further apart.
What is expanding?
300
This unit of measurement is equal to 150 million kilometers.
What is an astronomical unit (AU)
400
Star death occurs when a star runs out of this fuel.
What is hydrogen?
400
This apparent change in the position of a star is used to determine a star's distance from Earth
What is parallax?
400
This kind of galaxy is undergoing lots of new star formation.
What is a starburst galaxy?
400
This shows the mathematical relationship between the distance of the galaxies and the speed at which they are moving away from us.
What is Hubble's Law?
400
Main sequence stars are stable because the force of nuclear fusion in the core pushes out as this force tries to push in so they balance each other out.
What is gravity?
500
This is gas blown off by a dying star.
What is a planetary nebula?
500
These kinds of stars are found below the main sequence on the H-R diagram.
What are white dwarfs?
500
This type of galaxy contains mainly older stars.
What is an elliptical galaxy?
500
This is the name for the end of the universe in the closed universe theory where the universe returns to the size it was at the time of the Big Bang.
What is the Big Crunch?
500
This type of star is smaller and denser than a white dwarf.