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Cosmos4Kids Quiz: Earth

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Iron: Symbol: "Fe" Atomic Number:"26" Atomic Mass: 55.85amu. Iron is one of the transition metals. You can find it in steel, meteorites, and the core of the Earth. The swirling iron (Fe) and nickel (Ni) core of the Earth helps to create our magnetic field.

Atmosphere: An atmosphere is a region of gases that surrounds a planet or moon. Not all planets or moons have atmospheres. For example, Saturn’s moon Mimas does not have an atmosphere. Astronomers once thought our Moon did not have an atmosphere, but it turns out there is a very thin atmosphere with sodium (Na) and potassium (K).

Axial Tilt: The axial tilt is the amount an object’s rotation is different from its orbital axis. For example, the Earth orbits the Sun on one plane. However, the Earth rotates around its axis at a different angle. The axial tilt allows the top part of our planet to face the Sun half of the year and the bottom to angle towards the Sun during the other half. The Earth has an axial tilt of 23.4 degrees. You may also hear the term “obliquity” for axial tilt.

Leap Year: A leap year is a calendar year with 366 days. The Earth orbits the Sun once every 365 and one quarter days. To make up for that quarter day in our calendars, we add a day every four years.

Astronomical Unit (au): This is a measurement of the average distance between the Earth and the Sun. For example, the distance from the Sun to the Earth is one au. Mars is about 1.5 au from the Sun and Uranus is over 19 au away.

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