Stars

Question 1

A star is a luminous ball of gas made out of mostly…

Answer 1

hydrogen and helium

Question 2

What is a star held together by

Answer 2

its own gravity

Question 3

What is the reaction in the core that support the star and produce photons and heat

Answer 3

Nuclear Fusion

Question 4

How can astronomers tell what elements a star is made from by the color of light they emit

Answer 4

Because different elements absorb different wavelength of light

Question 5

What does the HR diagram show

Answer 5

It represents the relationship between a stars surface temp and its absolute magnitude. It shows how a star changes over time.

Question 6

Very hot stars appear what color

Answer 6

Blue

Question 7

Average temp stars appear what color

Answer 7

Yellow, like our sun

Question 8

Cooler stars appear what color

Answer 8

Red

Question 9

The slight shifting in the apparent position of a nearby star due to the orbital motion of earth

Answer 9

Parallax

Question 10

When a star is too far away to use parallax, astronomers measure the distance with…

Answer 10

Light years

Question 11

The distance light travels in on year

Answer 11

Light Year

Question 12

How bright a star seems from earth

Answer 12

Apparent Magnitude

Question 13

How bright the star is actually

Answer 13

Absolute Magnitude

Question 14

A stars life expectancy depends on its….

Answer 14

Mass

Question 15

More massive stars have ______ lives

Answer 15

shorter

Question 16

Smaller stars have _____ lives

Answer 16

longer

Question 17

A type of interstellar cloud in space composed of gas and dust

Answer 17

Nebula

Question 18

Where is a star born

Answer 18

In the nebula

Question 19

What is it called when hydrogen turns into helium

Answer 19

nuclear fusion

Question 20

How are stars powered

Answer 20

By the nuclear fusion in their cores

Question 21

A developing star that are not yet hot enough to engage in nuclear fusion

Answer 21

Protostar

Question 22

When does the protostar becomes a main sequence star

Answer 22

When the gravity and pressure are maintained

Question 23

Our sun is in what stage of the star lifecycle

Answer 23

Main Sequence

Question 24

Stars spend __ percent of their life in the main sequence stage

Answer 24

90

Question 25

(red giant stage) When all of the hydrogen in a stars core is converted into helium the nuclear fusion...

Answer 25

stops

Question 26

(red giant stage) Energy is radiated outward increasing hydrogen fusion in...

Answer 26

The stars outer shell

Question 27

How much many times larger does a red giant get than a main sequence.

Answer 27

hundreds to thousands

Question 28

(red giant stage) As the star exands the surface...

Answer 28

cools and appears reddish while the core continues to collapse and heat up.

Question 29

Helium is converted to _______ in the red giant stage

Answer 29

Carbon

Question 30

High mass stars turn into ________ instead of red giants

Answer 30

Red Supergiant

Question 31

Low mass stars skip which stage in the life cycle

Answer 31

Red giant

Question 32

All stars will eventually collapse due to..

Answer 32

Gravity

Question 33

Once hydrogen and helium are exhausted the star will collapse into a

Answer 33

White Dwarf

Question 34

During a medium mass star collapse into a white dwarf, it ejects its outer layer called

Answer 34

Planetary Nebula

Question 35

An expanding shell of gas around an aging star

Answer 35

Planetary Nebula

Question 36

Red supergiant end in an explosion called

Answer 36

supernova

Question 37

Describe a white dwarf

Answer 37

Small, dense, and very hot

Question 38

White Dwarfs eventually turn into

Answer 38

Black Dwarfs

Question 39

Black dwarfs is when heat is radiated away and ______ is emitted

Answer 39

No Light

Question 40

After a supernova massive stars can become...

Answer 40

neutron stars (extremely dense) or black holes

Question 41

A rapidly spinning neutron star is called

Answer 41

Pulsar

Question 42

High mass stars are crushed by the strength of its gravity, and turns into a...

Answer 42

Black hole

Question 43

The boundary where light can not escape is called

Answer 43

event horizon

Question 44

The center of a black hole is called a

Answer 44

singularity

Question 45

When matter enters a black hole it is stretched out in the process called

Answer 45

spaghettification

Question 46

Wavelength and Frequency are _______ related

Answer 46

Indirectly

Question 47

Energy and Frequency are _______ related

Answer 47

Directly

Question 48

Wavelength and Energy are _______ related

Answer 48

Indirectly

Question 49

A single massive explosion that scientist believe created the universe

Answer 49

Big Bang Theory

Question 50

The galaxies that are farthest away seem to be moving the fastest is _______ ____

Answer 50

Hubble's law