13.5 P441 Textbook Questions

Question 1

What is meant by the local group of galaxies

Answer 1

The neighboring galaxies , the edge is where there is lots of empty space in relation to the size of the group

Question 2

Give two reasons to why elliptical galaxies are thought to be older and more evolved than spiral galaxies

Answer 2

The have very little interstellar mass
Rarely form new stars

Question 3

How do astrnomers think that irregular galaxies are formed

Answer 3

From collisions

Question 4

Describe how two galaxy’s colliding could produce a super massive black hole or a quasar

Answer 4

collisions between galaxies drive the gas towards the black hole and the center ; just before the gas is consumed by the black hole, it releases large amount of energy in the form of radiation , resulting in a the quasar

Question 5

Would life as we know it be able to exist on a planet that was circling a star in the galactic core

Answer 5

Life would not be able to exist as there are stars int hat area that produce large amount of radiation that woulddddddddddddd Kill all life

Question 6

What type of signal is given off by quasar

Answer 6

Radio waves

Question 7

What keeps galaxy clusters together

Answer 7

they are held together by mutual gravity