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Astronomy > Star⭐️ > Flashcards

Star⭐️ Flashcards

0
Q

Nebulas are held together by what two forces?

A

Gravity and heat

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1
Q

Stars begin from dark clouds of?

A

Dust and gas

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2
Q

How many stages does our sun go through to become star in main sequence

A

7

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3
Q

Stage one is called?

A

Interstellar cloud

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4
Q

What do we call newly formed area that will soon become a star?

A

Opaque region

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5
Q

Ability to plot movement of a protostar

A

Evolutionary track

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6
Q

Dark clouds of dust and gas are called?

A

Nebulas

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7
Q

Nebulas come from? And the matter in between stars is called?

A

Interstellar space

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8
Q

Two things happen to light when light from stars shines through it?

A

Reddening- freq of color remain the same

Dims

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9
Q

What is rarer to find in interstellar space? Gas or dust?

A

Dust - trillion gas molecules and 1 dust

Gas - in 1 cm3 of space is 1 atom of gas

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10
Q

Interstellar space is made up of what two elements?

A

9% helium

90% hydrogen

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11
Q

Dirty ice is in interstellar is similar to what other body?

A

Comets

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12
Q

These clouds of dust and gas are so thick they block out all background light

A

Dark nebula

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13
Q

If a cloud has hot young stars forming within it, it can glow this tho of cloud?

A

Emission nebula

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14
Q

Reflection nebulas are created by this?

A

Blue light reflecting

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15
Q

Dark areas amongst nebulas are called?

A

Dark dust clouds

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16
Q

Absolute zero temperature in kelvin and Celsius?

A

0 kelvin

-273 Celsius

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17
Q

Key element of our sun or any other star

A

Hydrogen

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18
Q

In 5 billion years this will be the main element of our sun

A

Helium

19
Q

When the helium core “fires up” and the hydrogen burns is called what?

A

Hydrogen shell burning

20
Q

As hydrogen burns and temp and size increase in a star what also increases?

A

Luminosity

21
Q

How hot does core have to be to fuse helium

A

10,000,000 Celsius

22
Q

When helium fuses to into carbon it is called

A

Helium flash

23
Q

90% of stars life is spent here?

A

Main sequence

24
Q

Low mass stars end life’s?

High mass stars end life’s?

A 
Low= calm
High= violent
25
Q

Death of stars gives universe what?

A

Heavier elements

26
Q

Before Big Bang there was this

A

Hydrostatic equilibrium

27
Q

As red giant grows and develops it is formed into two distinct areas

A

Exposed core

Dust cloud

28
Q

As envelope of red giant is blown off it gets illuminated by the core below. This cloud is called

A

Planetary nebula

29
Q

As Core contracts it forms this(not very hot but not to bright)

A

White dwarf

30
Q

When white dwarf burns out it becomes

A

Black dwarf

31
Q

If a white dwarf releases a lot of energy it is a process called

A

NOVA

32
Q

if a NOVA reoccurs over and over again it’s called

A

Recurrent NOVA

33
Q

Our sun is called?

A

1 solar mass star

34
Q

Where would you find low and high mass stars

A

Low mass are on bottom

High mass are on top

35
Q

Stars that are to small to ever ignite into a true star

A

Clinkers

36
Q

System of stars with two members

A

Binary system

37
Q

Two types of clusters

A

Open- loose irregular, young stars

Globular- oldest stars, millions, no blue

38
Q

Chase each other and never twinkle

A

Visual binaries

39
Q

Clusters are hard o se and form where?

A

Nebulas

40
Q

Supergiants have the strongest what?

A

Solar wind

41
Q

In less then 1 second the core of a supergiant can undo all the work that the star has done the previous 10 million years in a process known as

A

Photodisintegrarion

42
Q

When the core collapse

A

Core collapse supernova

43
Q

Dividing mass long between white dwarf and supernova?

A

8 solar masses

44
Q

Type 1 supernovas get mass needed from what?

A

Binary star

45
Q

After a star explodes into a supernova the leftovers are called

A

Supernova remnants

46
Q

Naturally occurring elements made in the cores of stars? (8 of them)

A 
Helium 
Sulfur
Magnesium 
Oxygen
Silicon
Carbon
Neon

Astronomy (8 decks)

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