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Star Power > Stars > Flashcards

Stars Flashcards

1
Q

A star is a luminous ball of gas made out of mostly…

A

hydrogen and helium

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2
Q

What is a star held together by

A

its own gravity

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3
Q

What is the reaction in the core that support the star and produce photons and heat

A

Nuclear Fusion

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4
Q

How can astronomers tell what elements a star is made from by the color of light they emit

A

Because different elements absorb different wavelength of light

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5
Q

What does the HR diagram show

A

It represents the relationship between a stars surface temp and its absolute magnitude. It shows how a star changes over time.

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6
Q

Very hot stars appear what color

A

Blue

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7
Q

Average temp stars appear what color

A

Yellow, like our sun

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8
Q

Cooler stars appear what color

A

Red

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9
Q

The slight shifting in the apparent position of a nearby star due to the orbital motion of earth

A

Parallax

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10
Q

When a star is too far away to use parallax, astronomers measure the distance with…

A

Light years

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11
Q

The distance light travels in on year

A

Light Year

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12
Q

How bright a star seems from earth

A

Apparent Magnitude

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13
Q

How bright the star is actually

A

Absolute Magnitude

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14
Q

A stars life expectancy depends on its….

A

Mass

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15
Q

More massive stars have ______ lives

A

shorter

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16
Q

Smaller stars have _____ lives

A

longer

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17
Q

A type of interstellar cloud in space composed of gas and dust

A

Nebula

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18
Q

Where is a star born

A

In the nebula

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19
Q

What is it called when hydrogen turns into helium

A

nuclear fusion

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20
Q

How are stars powered

A

By the nuclear fusion in their cores

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21
Q

A developing star that are not yet hot enough to engage in nuclear fusion

A

Protostar

22
Q

When does the protostar becomes a main sequence star

A

When the gravity and pressure are maintained

23
Q

Our sun is in what stage of the star lifecycle

A

Main Sequence

24
Q

Stars spend __ percent of their life in the main sequence stage

A

90

25
Q

(red giant stage) When all of the hydrogen in a stars core is converted into helium the nuclear fusion…

A

stops

26
Q

(red giant stage) Energy is radiated outward increasing hydrogen fusion in…

A

The stars outer shell

27
Q

How much many times larger does a red giant get than a main sequence.

A

hundreds to thousands

28
Q

(red giant stage) As the star exands the surface…

A

cools and appears reddish while the core continues to collapse and heat up.

29
Q

Helium is converted to _______ in the red giant stage

A

Carbon

30
Q

High mass stars turn into ________ instead of red giants

A

Red Supergiant

31
Q

Low mass stars skip which stage in the life cycle

A

Red giant

32
Q

All stars will eventually collapse due to..

A

Gravity

33
Q

Once hydrogen and helium are exhausted the star will collapse into a

A

White Dwarf

34
Q

During a medium mass star collapse into a white dwarf, it ejects its outer layer called

A

Planetary Nebula

35
Q

An expanding shell of gas around an aging star

A

Planetary Nebula

36
Q

Red supergiant end in an explosion called

A

supernova

37
Q

Describe a white dwarf

A

Small, dense, and very hot

38
Q

White Dwarfs eventually turn into

A

Black Dwarfs

39
Q

Black dwarfs is when heat is radiated away and ______ is emitted

A

No Light

40
Q

After a supernova massive stars can become…

A

neutron stars (extremely dense) or black holes

41
Q

A rapidly spinning neutron star is called

A

Pulsar

42
Q

High mass stars are crushed by the strength of its gravity, and turns into a…

A

Black hole

43
Q

The boundary where light can not escape is called

A

event horizon

44
Q

The center of a black hole is called a

A

singularity

45
Q

When matter enters a black hole it is stretched out in the process called

A

spaghettification

46
Q

Wavelength and Frequency are _______ related

A

Indirectly

47
Q

Energy and Frequency are _______ related

A

Directly

48
Q

Wavelength and Energy are _______ related

A

Indirectly

49
Q

A single massive explosion that scientist believe created the universe

A

Big Bang Theory

50
Q

The galaxies that are farthest away seem to be moving the fastest is _______ ____

A

Hubble’s law

Star Power (1 decks)

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