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100
Astronomers measure distances in a _______________
Light year
100
Where are stars born
Nebulas
100
A rapidly spinning neutron star that emits energy in pulses
Pulsar
100
A graph plotting each star's brightness against its temperature is a _______________________________
Hertzsprung-Russell diagram
100
A very hot, post-main sequence star that burns helium is a ___________________________
blue giant
200

The Milky Way is a ____________________________ galaxy

Spiral galaxy

200
Small stars (about the size of Earth), that are very dense hot stars made up mostly of carbon that are the remains after a red giant star has lost its outer layers
White dwarf
200
The sun is a _____________________________ star
Yellow dwarf
200
The most common type of star is a ______________________
Red dwarf
200
The sun's closest star neighbor is ___________________
Proxima Centauri
300
A relatively old star whose temperature has cooled and its diameter is about 100 times bigger than it was originally is a ______________________________
Red giant
300
A huge stellar explosion that is extremely bright but fades over several weeks or months
Supernova
300
A group of stars bound together by gravity is a ___________
Galaxy
300
Most galaxies have a __________________________ at the center.
Super massive black hole
300
A type of compact star that can result from the gravitational collapse of a massive star after a supernova
Neutron star
400
The ________________________ is the galaxy group that includes the Milky Way.
Local group
400
About 90% of the stars, including the sun, are _______________________________ because they fuse hydrogen into helium as their fuel source
Main sequence stars
400
When supergiant stars die, they become ________________________________
Black holes
400

The largest known type of star, some almost as large as our entire solar system are _______________________

Supergiant stars

400

The galaxy closest to the Milky Way is the _________________________________

Andromeda galaxy

500
___________________________ are what remains after a red giant star loses it outer layers
white dwarfs
500

Something that we can't see that has mass

Dark Matter

500
Really hot stars are __________________ in color and cooler stars are ______________________ in color.
Blue, red
500
How bright a star appears to be due to how close or far away it is ____________________________
Apparent magnitude
500
The only nebula visible from Earth with the unaided eye is the __________________________
Orion nebula
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