Question

Scientist are always learning new things. which of the following shows how scientist use observations to gain new understanding about the world?

A. scientists have discovered new planets orbiting a star by detecting a wobble in the star's motions.
B. Scientists hope to learn more about how many stars are in space.
C. Scientists are familiar with some galaxies, but they do not know how many galaxies exist.
D. Scientist wonder if other plants can support life, and some scientist wonder if there are aliens.

Answer 1

The answer is A because it is showing how they made an observation

Answer 2

A. scientists have discovered new planets orbiting a star by detecting a wobble in the star's motions.

Step-by-step explanation:

As can be seen from the options only first option shows an observation. Here the scientists observed the wobbling of the stars and through that they deduced that there will be planets orbiting around that star. This deductions stands true as the gravity of the planet affects the motion of the star as well. Other options do not show such instances.