Star Types

Star Types

Open Ended

There are 88 official constellations.

The first constellation I learned about was the big dipper. Here in Vegas, one of my favorite is Orion because it is one of the easiest to identify.

What was the first constellation you learned about or what is your favorite constellation?

Discussion Posts

"In some questions that I am wrong in the quiz I want to know the answers . . . or why sometimes I have a good one but it comes out wrong"

~ Always double check your spelling and your tense/plurality (i.e. is it took, take, taken, etc)

~ If unsure, ask in discussion board and I will let you know

"I had a similar question. I typed ecliptic in question 25, i'm not sure if I'm genuinely wrong or if the quiz just doesn't understand the spelling"

~ The question says: 'Zodiac stars are all along the ecliptic plane, which is the only place that ____ can occur.' The answer is 'eclipses' because that is where the word ecliptic comes from.

Multiple Choice

What determines the type of star a nebula will become?

• its size

• its color

• its mass

• its density

Multiple Choice

What type of star is the coldest?

• red giant

• brown dwarf

• main sequence

• white dwarf

• blue giant

Multiple Choice

What is the name for stars that are stable and performing hydrogen to helium nuclear fusion?

• main sequence

• white dwarf

• red giant

• neutron star

Multiple Choice

What type of star is the largest?

• red giant

• blue giant

• neutron star

• black hole

• white dwarf

Multiple Choice

What type of star is our sun?

• white dwarf

• red giant

• main sequence

• neutron star

• blue giant

Multiple Choice

What type of star is the most dense?

• neutron star

• blue giant

• black hole

• main sequence

• white dwarf

Multiple Choice

What type of star will be left behind when the sun runs out of energy?

• white dwarf

• neutron star

• black hole

• supernova

• red giant

Multiple Choice

Will an older star have more or less layers than a newer star?

• more

• less

• the same

Multiple Choice

An h-r diagram compares a star's temperature to what other property?

• color

• luminosity

• size

• brightness

Multiple Choice

What is the dependent variable of an H-R diagram?

• luminosity

• brightness

• temperature

• color

• size

Star Lifecycles

Birth - Nuclear fusion starts

Main sequence - reliable Hydrogen to Helium fusion (but any color or size)

Old Age - Red giant, red supergiant, blue giant, blue supergiant

Death - Stellar ejection (gas just escapes star); supernova (explosive release of gas)

Corpse - white dwarf, neutron star, black hole

Lifecycle Chart

Stages depend on size of the nebula that formed the star

Not all stars go through all stages

Larger masses go through more stages and more dramatic ends

HR Diagrams

Hertzsprung-Russel Diagram

HR Diagram

Compares temperature to light released

Can chart the life cycles of different stars

Temperature scale is BACKWARDS

Open Ended

Do you have any questions about stars?

- Do you understand the differences between types of stars?

- Do you know what determines the type of star?

- Do you know how to tell what stages a star goes through?

- Do you know how to read an HR Diagram?

Canvas Assignment

We are going to go over some of the information in your canvas assignment. Please go to canvas and start the canvas quiz.

Missing pieces

Not all types of stars are shown on an HR Diagram:

• supernova
• black hole
• neutron star
• nebula

These types of stars are literally "off the chart" because their temperature/luminosity values are too high or too low

Multiple Choice

Is a supernova hotter or colder than a normal star?

• hotter

• colder

Multiple Choice

Which part of the HR diagram shows hot stars?

• Left

• Right

• Top

• Bottom

Multiple Choice

Is a supernova more or less bright than a normal star?

• more bright

• less bright

Multiple Choice

Which part of the HR diagram shows bright stars?

• Left

• Right

• Top

• Bottom

Multiple Choice

Where on HR diagram would a supernova go?

• Top Left

• Top Right

• Bottom Left

• Bottom Right

Star Lifecycles

• Figure out the mass

• All stars start as a nebula

• Follow the steps of the lifecycle

Multiple Select

Which types of stars are common to all diagrams?

• nebula

• main sequence

• red giant

• blue giant

• white dwarf

Sun

Sun is a medium/intermediate star

All stars start as a nebula

All stars go to the main sequence

Multiple Choice

Which HR Diagram shows the life cycle of the sun?

• A

• B

• C

• D

Reminder

To teacher: change screen!

To students: questions are not shown to the class ,so please be honest without being embarrassed

Open Ended

Do you have any other questions/comments that you want me to cover?