Lecture 11

Question 1

What happens when the star runs out of H fuel in the core?

Answer 1

Gravity wins and the star shrinks = heating up core and expanding the star making it brighter, and cooler
-bigger surface area = cooler surface = red star

Question 2

Helium Burning Star

Answer 2

-he burning star is stable after the Helium flash

Question 3

variable star

Answer 3

double shell burning stars near the end of their lives

Question 4

End of Fusion

Answer 4

double-shell burning star gets bigger and bigger until the last pulse sends all H&He into space leaving the C core behind burning on its own
-the remaining core cannot support fusion into heavier elements

Question 5

Pulsar

Answer 5

• neutron star radiating along a magnetic axis

- the mass is spinning so fast that only a ball of neutrons could survive not

Question 6

neutron star

Answer 6

• ball of neutrons left over core from a star

- they pulsate

Question 7

Black holes

Answer 7

light cannot escape from the object

Question 8

special theory of relativity

Answer 8

no material object can travel faster than light
all motion is relative
-Postulates:
–Laws of nature are the same for all observers
–speed of light is the same for all observers

Question 9

Space, Time, Spacetime

Answer 9

• space is different for different observers due to their perspective
• time is different for different observers due to their perspective
• space time is the same for everyone

Question 10

general relativity

Answer 10

-gravity can bend light

Question 11

flat space

Answer 11

• parallel lines never meet

- triangle sums to 180

Question 12

curved space

Answer 12

• sphere changes

- triangle adds up to over 180

Question 13

four fundamental forces

Answer 13

• gravity
• electromagnetic
• strong force
• weak force