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27 Cards in this Set

  • Front
  • Back
Light emitted by the sun reveals?
surface temperature and absorption lines which allow us to determine it's composition
Outer parts of the sun contain?
2/3 Hydrogen, 1/3 Helium and a few percent everything else
How to determine the mass of the sun?
Gravitational influence it has on the earth and other planets
How to determine the sun's true size?
HOW FAR AWAY IS IT, the distance, using a radar
Knowing the sun's size and mass, what can we say about it's density?
LESS DENSE than Earth
What does the movement of the sunspots reveal?
Sun rotates differentially at the surface, therefore it is not solid in the outer parts
Fossil records tell us that Earth had liquid water oceans for billions of years therefore..
The sun's temperature and brightness has not changed drastically yet!
Enormous mass of the sun means that
What can withstand the huge pull of gravity?
How does the high temperatures effect the deep interior of the sun?
all elements are fully ionized, all electrons are stripped off, therefore the interior of the sun acts as PERFECT GAS
Fossil fuels
converting raw materials to plant structure
Hydro-electric power depends on
solar heating evaporates water, eventually falls onto high land, rushes down to sea, and turns turbines
Great ocean currents
arise based on differences of temperature in various parts of the oceans
Nuclear power plants, how is the energy released?
-radioactive elements used to heart water to steam
Mass of the sun..
some parts of the sun produce lots of energy and some produce none
How much energy does the sun contain?
LOTS but only a tiny fraction of energy leaks out
Density of the sun?
1.4 times that of water (outer)
150 times as dense as water (inner)
Rotation speed of the sun
we can measure directly
Movement of sunspots
differential rotation
differential rotation:
movement with different angular velocities
Structure of the sun in the outer parts?
Hydrostatic equilibrium
fluid body which is not changing in size and shape as time passes
Equilibrium configurations means for the sun..
it must be terrifically hot inside, SO HOT that random motions of particles provides sustaining pressure which counter the pull of gravity
Internal temperature of the sun
independent of the material of the sun is made of
Sources of the energy within the sun
the only thing that can maintain the massive sun against rapid inward collapse under its own gravity is the HEAT within it
What happens to the atoms within the core of the sun?
atoms are moving so rapidly, that collisions between them inevitably knock off all the orbiting elections around the atomic nuclei
What gas law does the sun follow?
PERFECT (or ideal) GAS LAW