The Crab Nebula (see Figure 7.41) pulsar is the remnant of a supernova that occurred in a.d. 1054. Using data from Table 7.3, calculate the approximate factor by which the power output of this astronomical object has declined since its explosion.

Figure 7.41

Table 7.3, 

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Table 7.3 Power Output or Consumption Object or Phenomenon Power in Watts Supernova (at peak) 5x1037 Milky Way galaxy 1037 Crab Nebula pulsar 1028 The Sun 4x1026 Volcanic eruption (maximum) 4x1015 Lightning bolt 2x1012 Nuclear power plant (total electric and heat transfer) 3x10º Aircraft carrier (total useful and heat transfer) 108 Dragster (total useful and heat transfer) 2x106 Car (total useful and heat transfer) 8×104 Football player (total useful and heat transfer) 5x103 Clothes dryer 4x103 Person at rest (all heat transfer) 100 Typical incandescent light bulb (total useful and heat transfer) 60 Heart, person at rest (total useful and heat transfer) 8 Electric clock 3 Pocket calculator 10-3