Show:
Galaxies
Star Lab
HR Diagram
Gravity/Fusion
Nuclear Fusion
100
The galaxies were classified by shape.
When Edwin Hubble made what is now known as Hubbles Code, how where Galaxies classified?
100
Because it is yellow and is a medium heat. The sun is fusing H into He
How can we tell our sun is a main sequence star?
100
This can happen because that main sequence star could be on the verge of becoming a red giant, but at that moment is still bright like a main sequence
How can a main sequence star be as hot as a red giant according to the graph?
100
They both can be stronger at different times.
Is fusion stronger than gravity, or is gravity greater than fusion?
100
Main Sequence turn H to He. Red giants turn He to C. White dwarfs die out.
which stars fuse which elements?
200
barred spiral galaxy
Scientists originally thought that our galaxy (The Milky Way) was a spiral galaxy, what kind of galaxy do scientists know it is now? Hint: Milky way candy
200
Red giants are cool because the heat has to spread out among the whole star and it turns cool.
Why are red giants cool?
200
The diagram goes from small to big, from bottom left to the top right. Dwarfs, Main sequences, to Red giants.
In the HR diagram, what pattern can be identified?
200
Gravity because the star is getting smaller, therefore gravity is in play while fusion can't happen.
Which force is stronger in a dwarf star?
200
when two nuclei of an element join together with more and more nuclei, they form new elements and change the stars. The amount of nuclei from the first element joined together determines the element... Think legos
How does nuclear fusion happen?
300
In an irregular galaxy there are young, new stars because when you look at an irregular galaxy you really don't see a bright nucleus of stars. This is because there is an abundance of dust and gas all around the galaxy, not just in the center.
Are there young stars or old stars in an irregular galaxy? Explain why
300
dwarf stars are hot because the heat doesn't need to spread out among the star. These stars are very hot, but they are not bright
Why are dwarf stars very hot?
300
This is because red giants are always going to be bright and cool, they do not have a wide range like main sequence.
Why is there only red giants in the top right?
300
They are at equilibrium because they are both happening at an equal rate, causing the star to stay the same size, eventually our sun will have fusion take over and it will become a red giant.
In our sun, which force is stronger, fusion or gravity
300
When a star goes through nuclear fusion it gets more complex because the new element is made up of all new parts. This then make the star more complex as it goes through it's lifecycle.
How does the type of star change due to nuclear fusion?
400
In an elliptical galaxy, the most amount of dust is nowhere. elliptical galaxies contain old stars and all you see is a big bright dot. This is because all the gas and dust has turned into stars, leaving little dust and gas left.
In an elliptical galaxy, where is the most gas and dust? explain why
400
each gets classified through the HR diagram, and they all are in the same spot based on type of star because each main sequence star has a similar range of lux and heat as the next main sequence star.
Why are types of stars in the same general area as each other?
400
The sun would be placed in the middle with all the other main sequence stars. These stars are yellow, and medium in brightness and heat.
Where would the sun be placed on the HR diagram?
400
Fusion takes over. As the nuclei begin to build and build and build. The star will have fusion be stronger than gravity causing the star to expand and cool.
If main sequence stars are at equilibrium, how do they break equilibrium and become red giants?
400
Our sun is affected by nuclear fusion because it is turning H into He. Our sun is in the first stage.
How is our sun effected by nuclear fusion... what stage is it in?
500
In the arms because our solar system has lots of gas and dust and barred spiral galaxies arms contain the most gas and dust.
Where is our solar system located at in our galaxy and how do you know it is there?
500
In the star lab I see that dwarf stars are small, white, not bright hot,go in the bottom left corner of the HR diagram. Main-sequence stars are medium sized, yellow, medium brightness, medium heat, and go in the middle of the HR diagram. Giant stars are big, red, very bright, cool, and go in the top right of the HR diagram.
What pattern can be determined when looking at the star lab?
500
scientists though they saw the brightest star in the sky and had it labeled at 1. When they saw brighter stars they had to put them at the negative numbers, so the higher numbers on the diagram are dimmer.
What do the negative numbers have to do with the HR diagram?
500
Gravity because as the star gets smaller and smaller gravity pushes it together and the stars light will burn out.
When dwarf stars die out, which force is stronger?
500
Because a dwarf star doesn't usually got hot enough for carbon to fuse, so dwarf stars die out.
Why does nuclear fusion not occur in a dwarf star?