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Q&A: Supernova Remnants and Neutron Stars
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Q:
I was reading from the ABC Science site that the diameter of the
Cas A gas cloud is 10 light years and the event occurred 300
years ago. That would mean that this gas cloud is moving at a
rate of close to a tenth of the speed of light. Is that
true?
A:
The diameter of the Cas
A remnant is about 10 light years, so the radius is about 5
light years. Since the remnant is about 300 years old, its
expansion velocity is about 5/300 (=1/60) of the speed of
light!
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