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ASTR 1020 ch quiz 14&15
Terms in this set (20)
What balances the inward push of gravity inside the Sun?
thermal pressure of the gas
Which of the following parts of the Sun has the lowest temperature?
Why is the Sun very dense on the inside?
Pressure of the overlying gas keeps the density high
Why does the Sun shine?
What conditions are required for nuclear fusion of hydrogen to occur?
a temperature of millions of Kelvin, high density
If the Sun's core went out of balance and shrank a little, what would happen?
The density would increase, and fusion would speed up, releasing more energy.
How can we observe nuclear fusion in the Sun's core?
We can observe neutrinos produced in the core
The Sun's visible surface, or photosphere, has regions of strong magnetic field called:
Since the Sun's outer atmosphere, or corona, is millions of degrees but not very dense,
we see x-rays coming from it
How does solar activity affect Earth?
It can make beautiful aurora.
It can cause geomagnetic storms.
It can damage satellites.
It can disrupt electrical power.
The total amount of power that a star radiates is called its
Alpha Centauri and the Sun have about the same luminosity. Which one appears brighter?
How would the apparent brightness of Alpha Centauri change if it were 3 times farther away?
t would be 1/9 as bright
How do we determine the distance to nearby stars?
How can you tell the temperature of stars?
color - the hottest stars are "blueish white""
Where is a star located on the Hertzsprung-Russell diagram if it is burning hydrogen into helium in its core?
along the main sequence
On the Hertzsprung-Russel diagram, where are large cool stars located?
What is the most fundamental properties of a star in determining its evolution?
Based on the spectral type, we can estimate the masses of:
Which type of star is no longer undergoing nuclear fusion?
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