method that was used to discover pluto?

Question

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

look at irregularities (wobbles) in the motions of Uranus and Neptune

Pluto was discovered by Galileo through one of the first telescopes

use one of the first radio telescopes to measure cold radio waves from Pluto

look for patterns in the orbits of the moons of Neptune to see in

which direction Pluto would have escaped
take pairs of photographs several days apart and "blink" them

Answer 1

Various methods were employed in the search for Pluto...including irregularities in the orbits of Uranus and Neptune and looking for patterns in the orbits of Neptune's moons. However, it was blinking pairs of photographs that led to the actual discovery...though it was discovered near the area predicted by irregularities in Neptune's orbit. However, that turned out to be sheer coincidence....it quickly became apparent that Pluto was not the cause of those irregularities (which turned out to be an error caused by something else).

Really, your first and last statements are both true...because Clyde Tombaugh might not have been looking at that part of the sky if Pluto hadn't been predicted to be there.

To be clear though, neither Galileo nor radio telescopes had anything at all to do with it.

Answer 2

Pluto was discovered by "blinking" back and forth between similar photographs and looking for movement.

Answer 3

Why don't you read your textbook and find out!