What are the two key properties of a telescope, and why is each important? Also distinguish between refracting and reflecting telescopes.

According to Kepler’s third law: 

What was the Copernican revolution, and how did it change the human view of the universe?

The Northern Hemisphere’s Winter season begins when the sun is at winter ___________________.

Briefly describe the Moon’s cycle of phases. Can you ever see a full moon at noon? Explain.

The atomic nuclei of the same element always have the same number of neutrons.

Within the frost line, planetesimals were composed entirely of rock, and outside the frost line, planetesimals were composed entirely of ice.

What is (are) Jupiter’s main ingredient(s)?

Earth is closer to the Sun in January than in July. Therefore, in accord with Kepler’s second law: 

Choose only one answer