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what powers the sun
nuclear fusion Hydrogen atoms fuse together to make helium atoms,
the axis of the earth
points
sun rotates around its axis
one rotation every 28 days.
Surface temperature of the sun is
5000°C. The center is much, much hotter.
Solar flares are
eruptions of energy
Sun spots are
areas, 11 year cycle
the earth is closet to the sun during
winter
Energy can be transferred by
Conduction • Convection • Radiation
Conduction is the
the movement of heat through a substance
Convection is the
transfer of heat by mixing of a fluid
Winds are natural convection currents.
Radiation is the
transfer of energy that requires no physical medium
Radiation quality or type
to radiation wavelength
Warmer objects radiate
energy at shorter wavelengths than do cooler bodies
Wavelengths less than 4 µm are
shortwave radiation.
Wavelengths longer than 4 µm are
longwave radiation.
Intensity of electromagnetic radiation is
not depleted or reduced as it moves toward Earth.
Radiation intensity decreases in proportion to
the distance squared.
Earth’s average radiation form the sun is
1367 W/m2
Earth revolves around the Sun once every
365.25 days
Earth revolves the Sun in an
ecliptic plane annually, known as a revolution
Note 
Flashcard (116)