Question

in the early 1900s, astronomer percival lowell theorized the existence of a planet beyond neptune; however, he was never able to find \planet x.\ after lowells death, clyde tombaugh took up the search, using a telescopic camera to photograph areas where he thought planet x might be found. tombaugh used an amazing tool called a blink comparator to analyze these photos. equipped with two powerful microscopes, the device allowed the user to examine two different photographic images, taken at different times, using a dial to switch rapidly between them. tombaugh knew that planets, unlike stars, move in orbits—so he looked for minute differences that could signify a moving body. in february 1930, tombaugh found two images, taken six days apart, that were very slightly different: an object had changed locations. thanks to the blink comparator, he had found the elusive planet x, now known as the dwarf planet pluto.
it explains the difference between a microscopic view and a telescopic view.
it instructs the reader how to use a blink comparator to examine photos.
it explains how the blink comparator helped tombaugh compare photos.

Explanation:

Breve explicación:

El texto en negrita describe cómo el blink comparador, con sus dos microscopios y la capacidad de cambiar rápidamente entre imágenes fotográficas, permitió a Tombaugh examinar las imágenes y encontrar diferencias que indicaban un cuerpo en movimiento, lo que finalmente le ayudó a descubrir Plutón.

Respuesta:

It explains how the blink comparator helped Tombaugh compare photos.

Answer:

Breve explicación:

El texto en negrita describe cómo el blink comparador, con sus dos microscopios y la capacidad de cambiar rápidamente entre imágenes fotográficas, permitió a Tombaugh examinar las imágenes y encontrar diferencias que indicaban un cuerpo en movimiento, lo que finalmente le ayudó a descubrir Plutón.

Respuesta:

It explains how the blink comparator helped Tombaugh compare photos.