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Key Terms
Vocabulary
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100
The distance between the creast of one wave of electromagnetic radiation and the crest of the next one is its?
wavelength
100
What is a spectrograph?
A device that breaks light into colors and produces an image of the resulting spectrum.
100
The coolest stars are blue-whiite in color?
False, red
100
A large cloud of gas and dust in a galaxy is called a(n) ______?
nebula
100
When a star runs out of fuel, it cannot become a
protostar
200
A light year is a unit of ?
distance
200
What is a binary star?
A star system containing two stars.
200
A quasar is a type of globular cluster?
False, galaxy
200
A device used to detect radio waves from objects in space is called a(n) _______?
radio telescope
200
Parallax can't be used on a star if the star is too what?
far away
300
Patterns of stars in the sky are called ?
constellations
300
What is the universe?
All the space and everything in it.
300
A star is born when nuclear fusion begins inside a protostar?
True!
300
A(n) ________ telescope focuses light through a transparent lens.
refracting
300
How long a star "lives" depends on?
its mass
400
A neutron star that appears to produce pulses of radio waves is called a
pulsar
400
Our solar system is located in a spiral galaxy called the?
Milky Way
400
Sound waves are part of the electromagnetic spectrum?
False, they are not part
400
A(n) ________ telescope collects and focuses light by using a mirror?
reflecting
400
The Hertzsprung-Russell diagram graphs stars' what?
absolute brightness and temperature
500
The earliest stage of a star's "life" is called a?
Protostar
500
What is a black hole?
A black hole is an object with gravity so strong that nothing, not even light, can escape.
500
A stars absolute brightness is its brightness as seen from Earth?
False, apparent brightness
500
A star system in which one star blocks the light from another is called a(n) ______ _______?
eclipsing binary
500
The brightness of a star depends on what?
size and temperature