S4w3 star clusters, galaxies and galaxy clusters

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Read Read Overview six: The milky way and other Galaxies. (this is between chapters 14 and 15. Do you have any questions? This overview gives a brief summary of some basics on Galaxies.

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Match the mystery to the theory that we have no visual proof for

Draggable item		Corresponding Item
What causes the different shapes of the galaxies?		Dark matter surrounds the galaxy
Stars are moving fast enough that they should be flung off into space. Gravity is holding it in, but there seems to be more gravity than we can account for with what we see.		super-massive black holes
strange light and ejected hot gas at the center of galaxies		different amounts of internal energy of a galaxy

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Have you ever seen the Milky way, (on a trip, camping, somewhere away from city lights?)

yes

no

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How do we know the Milky way is flat and not a sphere?

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Read chapter 15:1 -15:3 Do you have any questions?

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We learned that nebulae are fairly big, and more than one star is usually born out of the same nebula at the same time. That is one way we can figure out the age of stars. because all stars in the same star cluster are assumed to be more or less the same age.

True

False

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What is a galaxy cluster?

A large group of stars within a single galaxy

A collection of hundreds to thousands of galaxies bound together by gravity 

A region of space where new galaxies are forming from cosmic dust

The central core of a spiral galaxy, containing its oldest stars

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watch this video on what will happen when andromeda collides with our galaxy: do you have any questions?

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There will probably be some stars that collide, but explain why the vast majority of stars will not collide with another star?

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He's talking a lot at the end about dark matter. from your reading what is your understanding of dark matter?

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remember all the way back to session 1 - we talked about orbits and gravity. We have equations that explain how fast a planet should move around a sun given what information about the star and the planet?

mass

volume

charge

density

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Long story short: We can see a whole lot of stuff, and we can guestimate its mass. we can also guestimate distances and how fast stuff is orbiting other stuff and at the end of the day. and none of the number work. All that stuff works in a solar system, why doesn't it work at the scale of a galaxy. So why don't the numbers work

We are wrong about how gravity works at large scales

We are wrong about the mass

We were wrong about the distances

We were wrong about the orbits

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If you clicked all of those, congrats! any of those might be PART of the problem. But when I said the numbers are off, i meant they are WAY off. so while we have have some things wrong about gravity distances and orbits, we think the majority of the wrong is in the mass. We think there is a lot of mass out there we just can't see. What mass have we already studied that we have a hard time seeing?

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Last video: its a little deeper into "what is dark matter"
do you have any questions?

1

What is a galaxy
What is a galaxy cluster
What are the different shapes galaxies come in

S4w3 star clusters, galaxies and galaxy clusters

Read Read Overview six: The milky way and other Galaxies. (this is between chapters 14 and 15. Do you have any questions? This overview gives a brief summary of some basics on Galaxies.

Match the mystery to the theory that we have no visual proof for

Have you ever seen the Milky way, (on a trip, camping, somewhere away from city lights?)

How do we know the Milky way is flat and not a sphere?

Read chapter 15:1 -15:3 Do you have any questions?

We learned that nebulae are fairly big, and more than one star is usually born out of the same nebula at the same time. That is one way we can figure out the age of stars. because all stars in the same star cluster are assumed to be more or less the same age.

What is a galaxy cluster?

watch this video on what will happen when andromeda collides with our galaxy: do you have any questions?

There will probably be some stars that collide, but explain why the vast majority of stars will not collide with another star?

He's talking a lot at the end about dark matter. from your reading what is your understanding of dark matter?

remember all the way back to session 1 - we talked about orbits and gravity. We have equations that explain how fast a planet should move around a sun given what information about the star and the planet?

Last video: its a little deeper into "what is dark matter"do you have any questions?

Read Read Overview six: The milky way and other Galaxies. (this is between chapters 14 and 15. Do you have any questions? This overview gives a brief summary of some basics on Galaxies.

Which of the following are the three shapes of galaxies

Match the mystery to the theory that we have no visual proof for

Have you ever seen the Milky way, (on a trip, camping, somewhere away from city lights?)

How do we know the Milky way is flat and not a sphere?

Read chapter 15:1 -15:3 Do you have any questions?

We learned that nebulae are fairly big, and more than one star is usually born out of the same nebula at the same time. That is one way we can figure out the age of stars. because all stars in the same star cluster are assumed to be more or less the same age.

What is a galaxy cluster?

watch this video on what will happen when andromeda collides with our galaxy: do you have any questions?

There will probably be some stars that collide, but explain why the vast majority of stars will not collide with another star?

He's talking a lot at the end about dark matter. from your reading what is your understanding of dark matter?

remember all the way back to session 1 - we talked about orbits and gravity. We have equations that explain how fast a planet should move around a sun given what information about the star and the planet?

Last video: its a little deeper into "what is dark matter"do you have any questions?

Last video: its a little deeper into "what is dark matter"
do you have any questions?

Last video: its a little deeper into "what is dark matter"
do you have any questions?