question archive 1)Satellites orbiting Earth have measured the Sun's total radiation to avoid any blockage of radiation by Earth's atmosphere
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of radiation by Earth's atmosphere. Other satellites have also observed the Sun from
difffferent locations, and have found that the Sun radiates the same amount of light in all
directions. Combining these measurements, we fifind the Sun's total radiation in all direc
tions, called its luminosity, is Lsun = 4 × 10
26
joules of energy each second (1 joule/sec =
1 Watt of power). How many hydrogen atoms are fused into helium atoms each second
in the Sun's core to create the Sun's luminosity?