If the sun has an iron core, it is likely to be extremely small. Why is that?
Question 5
5.
Question 6
6.
What happens when a star runs out of hydrogen to fuse?
Question 7
7.
imagine pushing a kid on a sled. you are near the top of a small hill, if you can push a kid hard enough, the kid will go up to the top of the hill and then slide down the other side. You only get one big push, if you don't push hard enough, the kid will just go up the hill a bit and then slide back down towards you. In this case the potential barrier is
Question 8
8.
Question 9
9.
Question 10
10.
Question 11
11.
I'm just going to give the answer to that last one away. It's the first one. explain here various things wrong with the answer "they contain 10x more iron as the surrounding region"
Question 12
12.
Explain what is wrong with the answer "nuclear reactions occur in them more slowly than in the surrounding gas"
Question 13
13.
Question 14
14.
Using data from the table below, and compare to an HR diagram. Which of the stars is a red giant?
Question 15
15.
What is the relationship between mass and luminosity?
Question 16
16.
In Math we talk about having 2 equations and 2 unknowns etc. If the number of unknowns is the same as the number of equations, you can sometimes find solutions. If there are more unknowns that equations, there will be infinite solutions. In astronomy, when learning about different types of stars we can use this. Our unknowns are things we cannot measure directly - Temperature, radius, distance, luminosity.
what is a list of things we can directly measure that can lead us to solve for these unknowns?
Question 17
17.
Please don't try to look up this answer, just answer as best you can. I'm trying to ascertain what you already know, not whether you have done the reading properly. What is the life cycle of a star the size of our sun?
Define Prominences:
Another word for solar flares
Plumes of glowing gas coming from the the chromosphere
Magnetic streams of hot plasma.
Massive bursts of light coming from the sun
What is Solar Wind?
A high-velocity stream of electrons that sweeps across the solar system
The leftover wind on earth spilling out into space
A flow of mainly hydrogen and helium that sweeps across the Solar System
Huge plumes of glowing gas that jut from the lower chromosphere into the corona
Our sun would sit on the H-R diagram in a stripe running from the lower right to the upper left. What is this stripe called?
Yellow dwarfs
normal stars
main sequence stars
young stars
Quantum tunnelling explains why fusion happens in stars despite the pressure and temperature being less than what is required to overcome the potential barrier between protons. The potential barrier refers to
the strong force between protons keeping the protons apart
The weak force between protons keeping the protons apart
the electromagnetic repulsive force between the protons keeping the protons apart
the gravitational force between protons keeping the protons apart
does a star need more less gravity to fuse helium compared to hydrogen?
more
less
Sunspots are dark because
They are cool relative to the gas around them
they contain 10x more iron as the surrounding region
nuclear reactions occur in them more slowly than in the surrounding gas
Clouds in the cool corona block our view of the hot photosphere