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Earth and sky terms

TermDefinition
Moon Earth's only natural satellite
Planet Object that orbits the sun
Number of planets in the solar system Eight
Number of planets visible without a telescope Five
How objects in the sky appear to move Depends on the motion of the Earth.
Meteor The bright streak of light produced when a small object burns up entering Earth’s atmosphere.
Comet A cold mixture of dust and ice that gives up a long trail of light as it approaches the sun. Very rare - Rarer than meteors.
Stars Inferred by scientists to be a giant ball of hot gas mainly composed of hydrogen and helium.
Constellation A pattern or group of stars that people imagined to represent a figure, animal or object.
Zodiac A narrow band in the sky where the planets appear to be.
Ecliptic A path the Sun travels in the sky. Planets and the moon follow a similar line.
Axis The imaginary line that passes through Earth’s center and the North and South poles.
Rotation The spinning of Earth on its axis
Revolution The movement of one object around another.
Orbit Earth's path
Calendar A system of organizing time that defines the beginning, length, and divisions of a year.
Solstices The day when the sun appears farthest north of the equator once each year and farthest south once each year.
Equinox "equal night”. Halfway between the solstices when neither hemisphere is tilted toward the sun.
Summer solstice The day in when the sun appears farthest north.
Winter solstice The day when the sun appears farthest south
Created by: deleted user