Chapter 16 Part B (Karly's 15)

Question 1

How do we express the idea that more distant galaxies move away from us faster

Answer 1

with Hubble’s law

Question 2

what is bubbles law

Answer 2

v=HoXd

Question 3

In principle Hubble’s Law applies to all distant Galaxies for which we can measure a

Answer 3

red shift

Question 4

Hubble’s law is problematic for measuring distance because:

1. it is astrophysics and makes my eye twitch
2. based on galaxies whose speed is determined by…
3. distances are only as accurate as our..

Answer 4

Hubble’s law is problematic because:

1. it is astrophysics and makes my eye twitch
2. based on galaxies whose speed is determined by expansion of the universe alone
3. distances are only as accurate as our best measurement of Hubble’s constant.

Question 5

Problem one of Hubble’s law means it does not work at all for

Answer 5

galaxies that are gravitationally bound together- like ours and the local group.

Question 6

Who was the first person to publish the discovery of the expanding universe? Who else discovered it on their own and made it famous?

Answer 6

Lemaitre

Hubble

Question 7

One of the main missions of the hubble space telescope

Answer 7

measure bubble’s constant

Question 8

Distance chain summary: RPMCDH

Answer 8

1. Radar Rangin
2. Parallax
3. Main-sequence fitting
4. Cepheid variables
5. Distant standards
6. Hobble’s law

Question 9

The Hubble Telescope helped to figure out that bubble’s constant is about…
So a galaxy that is 100 million light years away should be moving away from us at a speed between…

Answer 9

• 21-23km/s per million light-years.

- 2100 and 2300 km/s.

Question 10

The expansion of the universe implies that is started

Answer 10

at a single moment in time

Question 11

The idea the universe has no edges and on a large scale looks the same everywhere is the

Answer 11

Cosmological Principle

Question 12

The rate at which the universe expands tells us

Answer 12

how old it is

Question 13

If I say, a galaxy is 400 million light years away what I really mean is, the light…This is called?

Answer 13

took 400 million years to get to me.

Look Back time

Question 14

We cannot see anything beyond the _______ _______ which represents the distance at which look back times equal __________

Answer 14

Cosmological horizon

14 billion years

Question 15

A galaxy with a 13 billion year look back time in a 14 billion year universe must be…

Answer 15

Less than a billion years old

Question 16

A galaxy with less than a billion years look back time is

Answer 16

13 billion years old

Question 17

The most massive galaxies in the universe =________ which formed via…

Answer 17

central dominant galaxies / galactic cannabalism… hmmm??

Question 18

Quasars produce luminositities up to…and can be up to a ___________times as luminous as the sun

Answer 18

1000 times that of the Milky Way

-trillion