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Last updated 4:24 PM on 9/8/26
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17 Terms

1
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constellation

a group of stars that make up a pattern in the sky

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binary star

two differently sized stars that are held together by gravity

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parsec

3.26 ly

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parallax

apparent shift in an object from two different angles

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apparent magnitude

how bright a star is from earth

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absolute magnitude

how bright a star is from 10 parsecs

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luminosity

how much energy an object produces

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HR diagram

a graph used to show temperature and luminosity

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main sequence

A star that fuses hydrogen and helium

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nebula

a giant cloud of gas

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protostar

hot object at the center of the nebula

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neutron star

collapsed dense core of a massive star

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pulsar

a neutron star that emits beams of radiation

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supernova

outer layers of massive star bouncing off the core

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black hole

a massive collapsed neutron star

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isotope

same element with different mass

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event horizon

the invisible point at the edge of a black hole