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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 __________.

When multiplying and/or dividing quantities, you should report

In about 14,000 years, the North Pole of the Earth’s axis will be pointing towards which star?

A lunar eclipse can occur only when the Moon is in or near the ___________ phase.