Earth's Star
HR Diagram
Units
Forces
Life Cycle
Orbits
Misc!
100
Earth's star (the sun) is this color.
Yellow
100
Name what is on each axis of the HR diagram
X axis: Temperature
Y axis: Luminosity or brightness
100
What unit of temperature do we use to measure stars?
Kelvin
100
What causes the inward force on stars?
Gravity
100
All stars go through which two phases?
Main sequence and red giant
100
What is the shape of most planets' orbits in our solar system?
Circular
100
What is another name for "The Zone of Habitability"?
The Goldilocks Zone
200
How many solar masses is Earth's star?
1 solar mass
200
What is unusual about the x axis of the HR diagram?
The highest temperatures are on the left.
200
What unit of size do we use to measure stars?
Solar mass
200
What causes the outward force on a star?
Nuclear fusion
200
What is the final stage of life for medium size stars?
Neutron stars
200
Pluto does not orbit in the same way as other planets. It's pulled out of orbit when it crosses the path of this planet.
Neptune
200
All stars are made of what TWO elements?
Hydrogen and helium
300
By the time it "dies", Earth's star will have existed for this many years.
10 billion
300
On the HR diagram below, show where Red Giants would be found.
Upper right
300
What unit of brightness do we use to measure stars?
Number of suns
300
When the two forces in a star are balanced, what is that called?
Equilibrium
300
All stars start in a cloud of gas and dust called a:
nebula
300
The comet Borrelly's water exists as two different phases. What are they?
Ice and gas (vapor)
300
Explain the nuclear reaction (what goes in, what comes out).
Hydrogen goes in.
Helium, a proton, and energy come out.
400
The object in our solar system with the highest amount of gravity is:
The Sun!
400
On the HR diagram below, show where "main sequence" stars are found.
Someone in your group should know this! :)
400
What is the main gas in a nebula?
Hydrogen
400
What life phase is a star in when their forces are balance?
Main sequence
400
At the beginning of a star's life, what is the main force?
Gravity
400
Our entire galaxy orbits around what structure?
A black hole
400
What is "extinction"?
When an organism whole species dies out, never to return again.
500
Besides our Sun, what star is closest to our solar system?
Proxima Centauri
500
What does the "HR" in "HR diagram" stand for?
Hertzsprug-Russell
500
This is a free space! Add the points to your score!
YAY!
500
Explain WHY larger stars can make heavier elements like iron.
They have more gravity due to their size, so therefore they can push heavier elements together.
500
Explain WHY the largest stars become black holes at the end of their lives.
They have a lot of gravity, so when nuclear fusion stops, the enormous amount of gravity collapses the star into a black hole.
500
What is the shape of comet borrelly's orbit?
An oval
500
What star did you write your CER about?
Answers will vary!