Careful studies of Earth’s magnetic field for the past 330 million years shows that it has _____________ many times.

The energy involved in the gravitational attraction between a planet and the Sun is called _______ energy.

Which statement best describes the atmosphere of Venus?​

​From observations made of Uranus, scientists have discovered that belt-zone circulation is dominated by what planetary characteristic?

What modern-day instrument do astronomers use to record images from telescopes?

​What astronomical object is the most important source for determining the age of our Solar System?

​Which was the source of lava during the flooding stage of the Moon’s development?

It is believed that a giant impact may have taken away some of Mercury’s low-density crustal rock and left a small, dense world with a(n) large, dense, and _______________ core.

What is the tilt of Pluto’s rotational axis?

According to Galileo, the acceleration of a freely falling object due to gravity is ____.​