H-R Diagrams

Question 1

How many stars are in the Main sequence

Answer 1

90%

Question 2

Luminosity on the diagram increases or decreases

Answer 2

Increasing

Question 3

Does temperature on an H-R diagram increase or decrease

Answer 3

Decrease

Question 4

Massive stars age the same as low mass stars t/f

Answer 4

False

Question 5

What are the layers of a star in order from bottom to top

Answer 5

Core
Radiation Zone
Convection Zone
Photosphere 
Corona

Question 6

When drawing out the layer of the star what does the star look like? And what items need to be added in the layers?

Answer 6

The layers drawn out look like a pizza with waves at the top
Arrows need to be added going up in the radiation zone
Convection current arrows need to be added in the convection zone

Question 7

How old is our sun

Answer 7

4.6 billion years old

Question 8

What is the estimation of stars in the universe

Answer 8

over 1*10^24

Question 9

What is the suns makeup

Answer 9

73% hydrogen and 25% helium

Question 10

Where is a star formed

Answer 10

nebula

Question 11

What are the steps when the star is born

Answer 11

Gasses in the nebula contracts and start to spin flattening into a disk
The disk spins faster and faster attracting more gas and creating a hot dense core called a proto-star
When it gets enough it begins nuclear fusion and after thousands to millions of years it becomes a star

Question 12

What happens when a small star die

Answer 12

the outer layer expand into a red giant
the core collapses leaving lots of gas in the outer area called a planetary nebula
The outer gasses get ejected leaving a small white dwarf star

Question 13

What happens when a large and massive star die

Answer 13

the outer layer expand into a super giant
the core collapses causing a super nova explosion
outer gasses get ejected
Large star-leaving an incredibly dense neutron star
Massive star-leaving an infinitely dense black hole

Question 14

what color is the coldest and what color is the hottest

Answer 14

Red-coldest

Blue-hottest

Question 15

What dies off first blue or red

Answer 15

blue

Question 16

describe how a drawing of a neutron star looks like

Answer 16

An egg with smoke coming from the top and bottom

Question 17

what does the graph of a life cycle of a star

Answer 17

stellar nebula–>average star–>red giant–>planetary nebula–>white dwarf
or
stellar nebular–>massive star–>red supergiant–>supernova–>neutron star or black hole

Question 18

on the notes on the back what is the death of a low mass star

Answer 18

evolve-never evolve into a red giant
remain-stable main-sequence until hydrogen gone
collapse-white dwarfs

Question 19

what are the notes on the back of a planetary nebula

Answer 19

This is left when a giant loses its outer layers of gas–>leaves the core–>core will become a white dwarf

Question 20

what are the colors of the H-R diagrams from left to right

Answer 20

Blue
White
Yellow
Orange
Red

Question 21

once a star runs out of hydrogen it runs on

Answer 21

helium

Question 22

what does a star use for fuel

Answer 22

hydrogen

Question 23

what are the notes on the back of a neutron star

Answer 23

supernova explosion core condense neutrons
rotates very rapidly-faster than blender
gravity so extreme-Everest will be a centimeter high
hot-glow in x-ray

Question 24

the gravity of a neutron star is so great that Everest would be

Answer 24

a centimeter tall

Question 25

which stars have high mass and short life

Answer 25

stars with higher luminosity or stars at the top of the diagram

Question 26

which stars have low mass and long life

Answer 26

stars with lower luminosity or stars at the bottom of the diagram

Question 27

a star that fuses hydrogen faster will be hotter or cooler

Answer 27

hotter