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universe vocab > universe > Flashcards

universe Flashcards

1
Q

a brightness scale used to measure how bright a star would be if it were seen from a standard distance

A

absolute magnitude

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2
Q

the brightness of a star as seen from the earth

A

apparent magnitude

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3
Q

a large collection of stars, dust and gas bound together by gravity

A

galaxy

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4
Q

a graph that shows a relationship between a stars surface temperature and the stars magnitude

A

HR diagram

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5
Q

the distance that light travels through space in 1 year

A

light-year

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6
Q

the actual brightness of a star

A

luminosity

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7
Q

the region where stars spend most of their time

A

main sequence

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8
Q

a large cloud of dust and gas in interstellar space

A

nebula

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9
Q

the core of supernova that collapsed under gravity

A

neutron star

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10
Q

a relatively large spherical body that orbits a star

A

planet

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11
Q

a highly magnitized rotating neutron star that emits a beam of electromagnetic radiation

A

pulsar

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12
Q

the motion of a body that travels around another body

A

revolution

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13
Q

the spin of a body on it’s axis

A

rotation

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14
Q

the rotation of large and small bodies that orbit our central star, the sun

A

solar system

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15
Q

a large celestial body that is composed of gas and emits light

A

star

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16
Q

the distance between two adjacent troughs or crests

A

wavelength

17
Q

a gigantic explosion in which a massive star throughs its layers into space

A

supernova

18
Q

space and all the matter and energy in it

A

universe

19
Q

the hot, dense, dim core of that remains from the collapse of a low-mass star

A

white dwarf

20
Q

a galaxy shaped like a pinwheel, with a bulge in the center and spiral outwards

A

spiral galaxy

21
Q

a shpereical galaxy with a bright center and very little dust with gas

A

elliptical galaxy

22
Q

a galaxy with an irregular shape that does not fit into another catagory

A

irregular galaxy

23
Q

all of the different wavelengths and frequencies of electromagnetic raditation

A

electromagnetic spectrum

24
Q

the theory that all matter and energy in the universe was compressed into a really small volume

A

big bang theory

25
Q

the electromagnetic raditation left over from the formation of the universe

A

cosmic microwave backround

26
Q

when a star or galaxy is moving away from the earth

A

red shift

27
Q

change in frequency or wavelength when a source is moving with respect to the observer

A

doppler effect

28
Q

a tool used to collect light from stars and seperate the colors in the light

A

spectroscope

universe vocab (1 decks)

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