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Science > Star vocab > Flashcards

Star vocab Flashcards

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1
Q

an invisible form of energy that creates a repulsive force causing the universe to expand.

A

dark energy

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2
Q

the distance light travels in one year.

A

light-year

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3
Q

smallest type of hydrogen burning star

A

red dwarf

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4
Q

a galaxy exhibiting a central nucleus from which extend curved arms of higher luminosity.

A

spiral galaxy

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5
Q

red giant

A

a low mass star toward the end of its life that is running out of hydrogen to fuse into helium

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6
Q

Doppler shift

A

the shift to a different wavelength.

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7
Q

galaxy

A

a huge collection of stars, gas, and dust.

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8
Q

a high mass star toward the end of its life that is running out of hydrogen to fuse into helium

A

supergiant

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9
Q

spiral galaxy

A

a galaxy exhibiting a central nucleus from which extend curved arms of higher luminosity.

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10
Q

planetary nebula

A

formed after helium in a star’s core is gone, it casts off its gases.

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11
Q

forms as the core of a giant star no longer supports fusion and the star’s outer layers escape into space, leaving a hot and dense core.

A

white dwarf

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12
Q

the shift to a different wavelength.

A

Doppler shift

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13
Q

a galaxy that has a generally elliptical shape and that has no apparent internal structure or spiral arms

A

elliptical galaxy

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14
Q

dark energy

A

an invisible form of energy that creates a repulsive force causing the universe to expand.

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15
Q

an enormous explosion that destroys a star.

A

supernova

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16
Q
A
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17
Q

a star with a much larger radius and luminosity than a main sequence star of the same surface temperature.

A

giant star

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18
Q

a low mass star toward the end of its life that is running out of hydrogen to fuse into helium

A

red giant

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19
Q

Milky Way galaxy

A

the spiral galaxy of which the Sun and the solar system are a part.

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20
Q

light-year

A

the distance light travels in one year.

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21
Q

an invisible form of matter that does not emit any detectable electromagnetic energy of its own.

A

dark matter

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22
Q

supergiant

A

a high mass star toward the end of its life that is running out of hydrogen to fuse into helium

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23
Q

a large ball of gas held together by gravity with a core so hot that nuclear fusion occurs.

A

star

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24
Q

a graph that plots luminosity v. temperature of stars.

A

Hertzsprung Russell Diagram

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25
Q

supernova

A

an enormous explosion that destroys a star.

26
Q

Hertzsprung Russell Diagram

A

a graph that plots luminosity v. temperature of stars.

27
Q

the true brightness of an object

A

luminosity

28
Q
A
29
Q

a measure of how bright a star appears from Earth.

A

Apparent Magnitude

30
Q

an area in space that is so dense that nothing, including light, can escape its gravitational pull.

A

black hole

31
Q

the measure of the true brightness of a star. (depends on the star’s temp. and mass)

A

absolute magnitude

32
Q

white dwarf

A

forms as the core of a giant star no longer supports fusion and the star’s outer layers escape into space, leaving a hot and dense core.

33
Q

cosmic background radiation

A

leftover energy from the Big Bang.

34
Q

the spiral galaxy of which the Sun and the solar system are a part.

A

Milky Way galaxy

35
Q

elliptical galaxy

A

a galaxy that has a generally elliptical shape and that has no apparent internal structure or spiral arms

36
Q

the theory that the universe began as a point and has been expanding ever since.

A

Big Bang Theory

37
Q

neutron star

A

super bright, dense star left over from a supernova

38
Q

a cloud of gas and dust in space that develops into a star.

A

protostar

39
Q

a star that fuses hydrogen into helium in its core

A

Main sequence star

40
Q

black hole

A

an area in space that is so dense that nothing, including light, can escape its gravitational pull.

41
Q

universe

A

all of space and everything in it including stars, planets, and galaxies.

42
Q

all of space and everything in it including stars, planets, and galaxies.

A

universe

43
Q

protostar

A

a cloud of gas and dust in space that develops into a star.

44
Q

Big Bang Theory

A

the theory that the universe began as a point and has been expanding ever since.

45
Q

star

A

a large ball of gas held together by gravity with a core so hot that nuclear fusion occurs.

46
Q

absolute magnitude

A

the measure of the true brightness of a star. (depends on the star’s temp. and mass)

47
Q

red dwarf

A

smallest type of hydrogen burning star

48
Q

a huge collection of stars, gas, and dust.

A

galaxy

49
Q

super bright, dense star left over from a supernova

A

neutron star

50
Q

a cloud of gas and dust.

A

nebula

51
Q

formed after helium in a star’s core is gone, it casts off its gases.

A

planetary nebula

52
Q

a galaxy with no identifiable shape or structure.

A

irregular galaxy

53
Q

irregular galaxy

A

a galaxy with no identifiable shape or structure.

54
Q

nebula

A

a cloud of gas and dust.

55
Q

Apparent Magnitude

A

a measure of how bright a star appears from Earth.

56
Q

luminosity

A

the true brightness of an object

57
Q

dark matter

A

an invisible form of matter that does not emit any detectable electromagnetic energy of its own.

58
Q

Main sequence star

A

a star that fuses hydrogen into helium in its core

59
Q

giant star

A

a star with a much larger radius and luminosity than a main sequence star of the same surface temperature.

60
Q

leftover energy from the Big Bang.

A

cosmic background radiation

Science (22 decks)

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