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__________ is an extremely large collection of stars bound together by mutual gravitational attraction.

The Sun’s energy is generated from the fusion of

Which of the following is(are) believed to be material that never collected into a single planet?

Which of the terrestrial planets has rings?

The planet Jupiter has the largest moon (Ganymede) and the most moons (67 known) of any planet in the solar system. Most moons are small, but of the 181 known moons in the solar system, Earth’s moon is larger than all but __________ other moons and is even larger than Pluto.

The four planets closest to the Sun, including Earth, are classified as __________ planets, while the four “gas giants” are classified as __________ planets.

The Sun’s photosphere is, by mass, about 75%

Which of the following planets has the most moons?

All planets in our solar system __________ counterclockwise around the Sun while each also __________ on its own axis.

The heliosphere is defined as the volume of space over which the ______________ extends.