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28 Cards in this Set

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The spinning of the Earth around its axis. It takes 24 hours to rotate 1 time. The spinning is the reason for night and day.
rotation
The movement of the Earth around the Sun. It takes 365.25 days or 1 year to make a complete orbit.
revolution
The first day of summer. The longest day of the year. The North Pole is pointing toward the sun.
summer solstice
The first day of winter. The shortest day of the year. The North Pole is pointing away from the sun.
winter solstice
The shadow produced by the moon passing between the Sun and the Earth.
solar eclipse
The shadow on the moon produced by the Earth passing in front of the Sun.
lunar eclipse
Study of stars, planets, and other objects that make up the universe.
astronomy
All of space and everything in it.
universe
A group of stars, gas, and dust held together by gravity.
galaxy
The Sun and all the objects that travel around it. It lies near the edge of the Milky Way galaxy.
Solar System
The galaxy where our Solar System exists.
Milky Way
Distance light can travel in 1 year.
light year
The path taken by one celestial body in its revolution about another.
orbit
The average distance from the Earth to the Sun.
AU - astronomical unit
An man-made object that is launced into space to gather information and send it back to Earth.
artificial satellite
Glowing balls of gases that live millions and millions of years. A star uses its gases, hydrogen and helium, to produce light and hear.
stars
Group of stars within a particular region of the sky that form a pattern.
constellation
Center of our solar system.
Sun
Bodies that orbit the sun and produce no light but reflect the sunlight.
planets
Fuzzy star that travels around the Sun in an oval path. Its center is made of frozen gases and frozen water mixed with dust.
comet
Solar fragments made of rock and metal that revolve around the Sun between the orbits of Mars and Jupiter.
asteroid
Smaller chunk of an asteroid that has broken off and fallen into the Earth's atmosphere.
meteoroid
The name of the inner planets; Mercury, Venus, Earth, and Mars.
terrestrial planets
The name of the outer planets; Jupiter, Saturn, Uranus, Neptune, and Pluto
jovian planets
The first day of autumn. The North Pole begins to point away from the Sun.
autumnal equinox
The first day of spring. The North Pole begins to point toward the Sun.
vernal equinox
The area in which the shadow of an object is partial.
penumbra
The area in which the shadow of an object is total.
umbra