Astronomy

In a solar system, the largest bodies orbiting the central star, such as our Sun, are __________.

• asteroids

• comets

• dwarf planets

• planets

Our solar system contains eight planets — Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. These planets make __________orbits around the Sun.

• elliptical

• circular

• octagonal

• sperical

Moons are bodies of rock that orbit _________. Moons are smaller than the planets they orbit.

• quarks

• comets

• planets

• stars

When the Earth spins on its own axis, it ________. It takes 1 day, or 24 hours, for the Earth to make one complete rotation on its axis.

• revolves

• pulses

• absconds

• rotates

The __________of the Earth is responsible for night and day.

• rotation

• revolution

• orbit

When the Earth ____________, it moves in an elliptical pattern around the Sun.

• rotates

• pulses

• revolves

• absconds

It takes the Earth 1 year, or 365 1/4 days, to make one complete ___________around the Sun.

• rotation

• revolution

• pass through

The moons in our solar system differ greatly in size. The largest of the moons in our solar system is Ganymede, which orbits ___________.

• Jupiter

• Mars

• Pluto

• Earth

The moons in our solar system also differ greatly in their ____________.

• orbit

• composition

• shape

Jupiter and Saturn are orbited by more than ____moons each. Jupiter is now believed to have the most moons of all the planets in our solar system.

• 30

• 10

• 400

• 60