Question

1. why do scientists use models and scales of the planets when studying them?

scales and models can be used when it is not possible to observe the planets firsthand.
scales and models are not useful to study the planets because it is easy for scientists to travel to all of the planets in the solar system.
it is impossible to study the planets any way other than by using models.
scales and models can be used since the universe is shrinking and scientists want to see how small the planets will be at the end of their existence

Explanation:

Scientists use models and scales when direct observation is not feasible. Planets are often too far away, too large, or too dangerous to study directly. Models and scales allow scientists to represent and study the planets in a more manageable way.

• The second option is incorrect because it is not easy for scientists to travel to all the planets in the solar system.
• The third option is incorrect because there are other ways to study the planets, such as through telescopes and spacecraft.
• The fourth option is incorrect because the universe is not shrinking, and scientists do not use models and scales to see how small the planets will be at the end of their existence.

Answer:

Scales and models can be used when it is not possible to observe the planets firsthand.