What New Technology Has Made It Possible for Astronomers to Do

question 34

Multiple Choice

What new technology has made it possible for astronomers to do "optical SETI" - searching for signals for extra-terrestrial civilization, not in the radio band of the spectrum, but in the visible-light band?

• A) the Hubble Space Telescope was put into orbit
• B) radio and TV signals have gone silent as much of the US adopts cable
• C) astronomers have developed adaptive optics to deal with the twinkling of the stars
• D) astronomers have built radio telescopes that can pick up the 3-degree microwave background
• E) we have developed the ability to make laser pulses that are briefly brighter than the Sun

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