What Method Was Used to Discover Pluto in 1929-1930

question 17

Multiple Choice

What method was used to discover Pluto in 1929-1930?

• A) look at irregularities (wobbles) in the motions of Uranus and Neptune
• B) use one of the first radio telescopes to measure cold radio waves from Pluto
• C) look for patterns in the orbits of the moons of Neptune to see in which direction Pluto would have escaped
• D) take pairs of photographs several days apart and "blink" them
• E) you can't fool me; Pluto was discovered by Galileo through one of his first telescopes

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