A big ball of glowing gas that gives off heat and light is called what?
100
The H-R diagram or HRD
The Hertzsprung–Russell diagram is also called...
100
Gravity
What holds a star together?
100
White dwarf
Planetary nebula's eventually die leaving behind a....
200
A group of stars containing somewhere between a dozen and a thousand stars.
What is a stellar cluster?
200
A High mass stars life
Black Holes are formed at the end of...
200
spectral class and absolute magnitude
What does Hertzsprung and Russell's Diagram plot?
200
Seven (O, B, A, F, G, K, and M)
How many classes of stars are there?
200
A binary star
What is a system of two stars that are gravitationally bound to each other called?
300
Earth's atmosphere moves and creates an illusion of twinkleng
Why do stars seem to twinkle?
300
A galaxy, made up of stars and planets.
The Milky Way is an example of what?
300
Ejnar Hertzsprung and Henry Norris Russell
What two scientists created a scatter graph of stars known at the H-R Diagram?
300
anywhere from 100,000 to 3,000,000,000,000 stars
How many stars to galaxy's usually contain?
300
A variable star is a star that changes in brightness
What is a Variable star
400
Globular and Open Clusters
What are the two types of Star Clusters?
400
middle-aged main-sequence
What stage is our sun in?
400
Fritz Zwicky and Walter Baade
What two astrophysicists proposed the idea that When a Massive Star reaches the end of its life, its gravity will crush the star and make the core collapse.
400
A White Dwarf
An average star's fate is always...
400
A star that has a low surface temperature and a radius much larger than the Sun.
What is a Red Giant?
500
Black Dwarf
What is a "failed" star called?
500
another 5 billion years
Most stars have a life of 10Billion years...about how many years does our sun have?
500
Charles Messier
Who was one of the first astronomers to observe and catalog star clusters along with other deep sky objects?
500
Planetary Nebulas or White Dwarfs.
What can Massive Stars NOT evolve into?
500
the core of the disk that formed from the clump of gas that was compressed inside the gas cloud.