The Discovery of the Peculiar Galaxy Cygnus a Was a Surprise

question 108

Multiple Choice

The discovery of the peculiar galaxy Cygnus A was a surprise to astronomers because

• A) the redshift of its radio wavelength signal was as high as anything measured up to that time.
• B) it was first discovered at X-ray wavelengths and detected at optical and radio wavelengths only some time later.
• C) it was so bright at optical wavelengths that no one expected it to be a galaxy.
• D) it was very faint at visible wavelengths but extremely bright at radio wavelengths.

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