Stars
Galaxies
More stars
More galaxies
Stars & galaxies
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

Patterns of stars in the night sky are called

Constellations

200

Stars are classified using these two criteria

temperature and luminosity

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 know type of star, some almost as large as our entire solar system are _______________________

Red supergiants

400
The galaxy closest to the Milky is the _________________________________
Andromeda galaxy
500
___________________________ are what remains after a red giant star loses it outer layers
white dwarfs
500

This is a massive cloud of gas and dust from which a star may form via gravity

Nebula

500
Really hot stars are __________________ in color and cooler stars are ______________________ in color.
Blue, red
500
The Milky Way is a ____________________________ galaxy
Spiral galaxy
500
The only nebula visible from Earth with the unaided eye is the __________________________
Orion nebula
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