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Cosmos4Kids Quiz: General Astronomy

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Gravity: Gravity is a fundamental force of nature that is based on the mass of an object. The greater the mass, the greater the gravity. Gravity pulls on other objects. In the Solar System, the Sun’s gravity holds the planets in orbit. The Moon is held in orbit around the Earth because of Earth’s gravity. You are held to the surface of the Earth because of gravity’s pull on you.

Galaxy: Galaxies are gigantic clumps of stars, stellar dust, planets and other types of matter. The Solar System exists in the Milky Way galaxy. Galaxies can have millions, billions or even trillions of stars. There are many types of galaxy shapes, but they all seem to rotate around a central region.

Solar System: The Solar System is the group of planets, asteroids, comets, and gases that orbit the Sun. The word “Solar” comes from the Latin word “Sol” which is the original name of the Sun. The Earth and other planets make up the system of the star Sol.

Satellite: In astronomy you will hear about natural and artificial satellites. Both objects orbit another object. An example of a natural satellite is the Moon as it orbits the Earth. An artificial satellite might be a GPS satellite that stays in geostationary orbit around the Earth. Artificial satellites are mandmade.

Heliopause: The heliopause the outer boundary of the Solar System. The Sun constantly gives off solar winds. Eventually, those winds start to slow and lose strength as they get further from the Sun. The boundary or shell around the entire Solar System is located where the solar winds cannot stop the push of stellar winds from neighboring stars.

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