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 Greenwich, England meridian is also known as the __________.

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

A synodic month, or a month of phases, is the time it takes the Moon to make one complete revolution around the Earth and is equal to __________ days.

The Sun projects charged particles into space, giving rise to a flow of radiation called the

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Which case saw the Supreme Court strike down the national Gun-Free School Zones Act as unconstitutional?