Author: Anonymous

If a planet orbits the Sun at a distance of 4 AU, then its orbital period is 8 years.

The force due to gravity has the mathematical form .

Kepler used Tycho’s observations to show that the planets

Which of the following people did NOT accept a heliocentric model for the universe?

The apparent visual magnitude difference between two stars is 10 and thus the approximate intensity ratio is 10,000.

For a first-quarter Moon, approximately what is the angle eastward from the Sun to the Moon?

A totally eclipsed Moon glows coppery red because

Which of the items below is electromagnetic radiation?

When it is winter in the northern hemisphere, it is ____ in the southern hemisphere.

At the time of the winter solstice (the start of winter) the sunlight is at a lower angle and thus is ____ than(as) in the start of summer in the northern hemisphere.