astronomy ch 16
Nuclear fusion of hydrogen into helium occurs in the...
energy moves through the sun's ____ by means of the rising of hot gas and falling of cooler gas
nearly all the visible light we see from the Sun is emitted from the ___
Most of the Sun's ultraviolet light is emitted from the narrow layer called the ____ where temperature increases with altitude
we can see the sun's ____ most easily during total solar eclipses
the ___ is the layer of the Sun between its core and convection zone
Rank these layers based on their distance from the Sun's center, from greatest to least.
corona, chromosphere, photosphere, convection zone, radiation zone, core
Rank the layers of the Sun based on their density, from highest to lowest.
core, radiation zone, convection zone, photosphere, chromosphere, corona
Rank the following layers of the Sun based on their temperature, from highest to lowest.
core, radiation zone, convection zone, photosphere
Rank the following layers of the Sun based on the pressure within them, from highest to lowest.
core, radiation zone, convective zone, photosphere
In which layer of the Sun does nuclear fusion occur?
Which of the following layers of the Sun can be seen with some type of telescope?
corona, chromosphere, photosphere
What would happen if the fusion rate in the core of the Sun were increased but the core could not expand?
The Sun's core would start to heat up and the rate of fusion would increase even more.
Overall, the Sun's average density is roughly the same as that of ___
The Sun spins on its axis roughly once each
The primary source of the Sun's energy is
fusion of light nuclei to make heavier ones
A typical solar granule is about the size of
large U.S. state
As we move to greater and greater distances above the solar photosphere, the temperature in the Sun's atmosphere
first decreases and then increases
The time between successive sunspot maxima is about
The solar neutrino problem is that
we detect fewer solar neutrinos than we expect
What is the single most important characteristic in determining the course of a star's evolution?
On the H-R diagram, red supergiants like Betelguese lie
at the top right
In the H-R diagram, the bright blue-white stars that dominate the naked eye sky lie to the
The Hertzsprung-Russell Diagram plots ________ against the spectral type or temperature.
luminosity or absolute magnitude
Which of the following is the most common type of star?
low mass main sequence
On the H-R diagram, the Sun lies
about the middle of the main sequence
Stars that have masses similar to the Sun's, and sizes similar to the Earth are
The most famous G type star is:
What physical property of a star does the spectral type measure?
What are the two most important intrinsic properties used to classify stars?
luminosity and surface temperature
what is proper motion
It is the annual apparent motion of a star across the sky.
The "Solar Neutrino Problem" refers to the fact that astronomers
detect only a third of the number of neutrinos expected by theory
The number of sunspots and solar activity in general peaks
every 11 years
What is probably responsible for the INCREASE in temperature of the corona far from the Sun's surface?
the suns magnetism
If neutrinos can escape from the solar core within minutes, then how long does it take a photon to escape?
millions of years
The proton-proton cycle involves what kind of fusion process?
hydrogen into helium
The Sun is stable as a star because
gravity balances forces from pressure
The density of the Sun is most similar to that of
The visible light we see from our Sun comes from which part?