Interstellar Medium
Main Sequence Star
Nebula
Star clusters
Fusion
100
This is a cloud of interstellar dust and gas within space.
What is a nebula?
100
Main sequence stars are on this diagram
What is H-R diagram?
100
This is the Latin word for cloud.
What is nebula?
100

This is the reason that stars in a cluster have similar composition.

What is formed from the same nebula?

100

This type of reaction produces energy in a star.

What is nuclear fusion?

200

These two things make up interstellar medium.

What are dust and gas?

200

Stars will remain on the Main Sequence until they run out of this fuel.

What is hydrogen?

200
This type of nebula is dense clouds of gas and dust that obstruct the view of more distant stars.
What is dark nebula?
200

This type of star cluster has 100's to 1000's of stars.

What is open?

200

Hydrogen atoms are fusing into this atom.

What is helium?

300
This gas makes up 75% of the interstellar medium.
What is hydrogen?
300
Percentage that an average star spends it's life on the main sequence.
What is 90%?
300
There are this many types of nebulas.
What is three?
300

This type of star cluster has millions of stars.

What is globular?

300
Fusion happens here in a star.
What is the core?
400
This gas makes up 25% of the interstellar medium.
What is helium?
400

This property of stars increases toward the upper left of the main sequence.

What is mass?

400
This nebula is produced when starlight scatters from a dusty nebula.
What is reflection nebula?
400

A globular cluster has many of this type of star.

What is red giant?

400

This force slowly pulls together particles within a protostar.

What is gravity?

500

What does "interstellar" mean?

What is "among/between the stars"?

500

What does OBAFGKM represent?

What are the spectral classes of stars?

500
This nebula is produced when a hot star excited the gas near it to produce an emission spectrum.
What is emission nebula?
500
This type of star cluster has newer stars that are on the main sequence.

What is open?

500

This equation developed by Einstein calculates the amount of energy released from a fusion reaction.

What is E=mc2?

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