The Interstellar Medium Flashcards

1
Q

What does the interstellar medium consist of?

A

Gas and dust clouds

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2
Q

What is a dark nebula?

A

It is dust blocking out light from stars

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3
Q

What is a emission nebula?

A

Glows due to the stars behind it

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4
Q

What is photo evaporation?

A

Stars destroy their nebula by burning and heating the gas

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5
Q

What’s the average temp of a dark dust cloud?

A

Few tens of k

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6
Q

How long is the wavelength when a electron changes rotation?

A

21cm in the radio wave

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7
Q

What it the temp of the densest clouds and what do they contain?

A

20K and contain molecules instead of atoms

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8
Q

What is the basic way to explain star formation?

A

A gas cloud contracts under gravitational forces and the core becalmed hotter until nuclear fusion

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9
Q

What can interfere with with the gravitational collapse?

A

Rotation and magnitism

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10
Q

What could cause a star to start form?

A
  • death of a nearby star
  • supernova
  • galaxy collision
  • density waves in galactic arms
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11
Q

Why does the luminosity of a protostar go down as it gets hotter?

A

Because it is getting more compact

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12
Q

How massive must a start be to start nuclear fusion

A

0.08 the size of our sun

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13
Q

What is the levels of elements in our sun

A

H-he-be-c

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14
Q

What is a detached binary system

A

When each star has its own Roche lobe

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15
Q

What is a nova

A

When a white dwarf accumulates a large amount of matter and burns it very quickly which makes it much brighter

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16
Q

What is a super nova

A

When a stars core fuses to iron then nuclear fusion stops so the star collapses due to gravity and recoils creating a large dust explosion

17
Q

How much brighter is a super nice than a regular nova?

A

1000000x

18
Q

What are the two types of super nova?

A

Iron core collapse

White dwarf accumulates way too much matter and explodes