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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.

Six trillion miles is equivalent in distance to one ______________.

Spring tides occur close to the time of ______________ moon.

In 2006, the International Astronomical Union (IAU) introduced a new classification for small solar-system bodies that are not satellites but orbit the Sun called __________, and placed Pluto, along with several other such bodies, in that category.

Ocean __________ are due to the gravitational attraction that the Sun and Moon, mainly the Moon, exert on the Earth.

According to the _______________ theory, the primordial nebula contracted under the influence of its own gravity, began rotating, and then flattened into a swirling disk of gas and dust setting the stage for the formation of our solar system.

Which planet is known for its rings?

The Sun, like other stars, radiates energy because of nuclear __________ of hydrogen nuclei into helium nuclei in the 15 million K temperatures of its core.

The solar system is a complex system of moving masses held together by __________ forces.