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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.

When the Moon appears to be getting larger, it is said to be

Add 10.35 cm + 2.721 cm and round the answer to the correct number of significant figures. Remember to include the unit with the answer.

Natural satellites that revolve around planets are known as __________.

The high temperatures on Venus are caused by

The best-known feature of the Moon’s surface are the craters, which are believed to have been formed by __________.