We Can Identify Only a Fraction of All the Radio

question 69

Multiple Choice

We can identify only a fraction of all the radio 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.
• E) neutron stars have tiny radii and are hard to detect even with large telescopes.

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