Stars
The amount of light energy emitted per second.
What is luminosity?
The reaction in which 2 nuclei combine to form a larger nucleus.
What is nuclear fusion?
A region of space that is so dense that not even light can escape its gravity.
What is a black hole?
A large cloud of gas and dust in space.
What is a nebula?
The distance light travels in one year.
What is a light-year?
The center region of a star.
What is the core?
Stars that have used up all their fuel and have begun to contract.
What is a red giant?
The name of our galaxy.
What is Milky Way?
The force that makes stars contract.
What is gravity?
The element produced by the fusion of hydrogen.
What is helium?
The brightness of a star as it appears on Earth.
What is apparent magnitude?
The color of the hottest stars in space.
What is blue?
A galaxy that is shaped like a football.
What is an elliptical galaxy ?
This is the fuel for a star.
What is hydrogen?
The speed of light.
What is 300,000 km/sec?
The true brightness of a star.
What is absolute magnitude?
The color of the coolest stars in space.
What is red?
The kind of galaxy that ours appears to be.
What is a spiral galaxy?
About 90% of the stars fall into this category of stars.
What is main sequence?
This characteristic of a star determines how its life will end.
What is mass?
The layer of a star where the light is emitted.
What is the photosphere?
The explosion of a supergiant star.
What is a supernova?
Galaxies that don’t have a definite shape.
What is an irregular galaxy?
An instrument used to determine what elements are in a star.
What is spectroscope?
The number of hydrogen atoms that must combine to form one atom of standard helium.
What is 4?