It is estimated that the sun will exhaust all of its energy in about ten billion years. By that time, it will have radiated about 1.2 × 10^44 J (joules) of energy. Express this amount of energy in
a. kilojoules.
b. nanojoules.
kilo = 1000, so divide by 1000
nano = 10-9, so divide by 10-9, or, equivalently, multiply by 109.
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