From our view, Mercury can reach a maximum separation from the Sun of _____

• 18°
• 23°
• 28°
• 33°

In 1639 the Italian astronomer Giovanni Zupi discovered that Mercury _____

• undergoes a complete cycle of phases
• has an elliptical orbit
• is covered in craters
• has an iron core

The model of the Earth orbiting the Sun is known as _____

• geocentrism
• heliocentrism
• the Ptolemaic model
• the Newtonian model

Mercury orbits the Sun at roughly _____ the distance of the Earth from the Sun.

• one half
• one third
• one quarter
• one fifth

What is Mercury's orbital period?

• 22 days
• 44 days
• 66 days
• 88 days

Mercury is only about 4900 kilometers in diameter, about _____ the Earth’s width.

• one fifth
• one quarter
• one third
• one half

Compared to other planets, Mercury has _____

• the most elliptical orbit
• the most circular orbit
• the largest mass
• the lowest density

The point in the orbit of a planet at which it is closest to the Sun is called _____

• perihelion
• aphelion
• acuhelion
• picohelion

What is the term for "the point in the orbit of a planet at which it is farthest from the Sun"?

• perihelion
• aphelion
• althelion
• phanhelion

The way the physics works out, tides like _____

• all rational numbers
• even multiples
• simple multiples
• odd multiples