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Unit 7:S and S

Eighth Grade Science

Equinox Daytime hours are equal to nighttime hours. March 21 is the vernal equinox, and September 21 is the autumnal equinox
Solstice December 21 (Winter) is the shortest day of the year, and June 21 (Summer) is the longest day of the year
Nuclear Fusion How a star makes enormous amounts of energy
Nebula A large cloud of gas and dust that spread out in an immense volume
Protostar A contracting cloud of gas and dust with enough mass to form a star
Axial Tilt 45 degree angle, that is the reason for our seasons
Brightness The amount of light energy falling on a surface. As distance increases, this decreases
Luminosity A total amount of light given off in all directions. Distance affects brightness, but not this
Main Sequence The stage of life that our Sun is currently in
Red Giant When a main sequence star starts to run out of fuel, it becomes this. Someday, our Sun will become this
White Dwarf A dying red giant becomes this. Someday, our Sun will become this
Created by: FutureFarmer



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