Question

1 our understanding about the universe and our place in it has changed over time. new information can cause us to rethink what we know and reexamine how we classify objects to better understand them. new ideas and views can come from questioning an existing theory.
what is a planet?
2 this simple question doesnt have a simple answer. defining the term planet is important, because such definitions reflect our understanding of the origins, architecture, and evolution of our solar system.
3 pluto, discovered in 1930, was identified as the ninth planet. pluto is much smaller than mercury and is even smaller than some of the planetary moons. though pluto kept its planetary status through the 1980s, things began to change in the 1990s with some new discoveries.
2
select the correct answer
based on the selection, what is the authors message about the new definition of planets?
a. the new definition for planets needs to be considered as settled moving forward
b. the iau used poor methods when setting a new definition for planets
c. pluto should not have been the reason why iau changed the definition of planets
d. it is uncertain whether the definition of planet will remain the same in the future

Explanation:

El primer párrafo dice que nuestra comprensión del universo cambia con el tiempo y que nuevas ideas surgen al cuestionar teorías existentes. El texto sobre la definición de planeta (que incluye el caso de Plutón) se ajusta a esta idea. Las opciones A, B y C no se respaldan en el texto. La opción D sí, ya que el primer párrafo implica que la comprensión (y por extensión, las definiciones como la de planeta) puede cambiar con el tiempo.

Answer:

D. It is uncertain whether the definition of planet will remain the same in the future.