Emission lines in the spectrum of the Crab Nebula exhibit a Doppler shift, which indicates that gas in that part of the nebula closest to us is moving toward us at 1450 km/s. Assume that the expanding gas has been moving at the same speed since the original supernova explosion, observed in 1054 A. D., and calculate what diameter (in light years) we should observe the nebula to have today.
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Emission lines in the spectrum of the Crab Nebula exhibit a Doppler shift, which indicates that gas...
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