We Can Identify Only a Small Fraction of All the Pulsars

question 29

Multiple Choice

We can identify only a small fraction of all the pulsars that exist in our galaxy because

• A) gas and dust efficiently block radio photons.
• B) few swing their beam of synchrotron emission in our direction.
• C) most have evolved to become black holes,which emit no light.
• D) massive stars are very rare.

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Variable Costs

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