Earth and Space

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Ellipse

a circular shape that looks like a narrow or flattened circle.

Axis

an imaginary line that passes through Earth's center and its North and South Poles.

Equator

an imaginary line around Earth equally distant from the North and South Poles.

Hemisphere

one half of the Earth.

Solar System

the Sun, all of the planets, and other objects that revolve around our Sun.

Moon

a body in space that orbits a planet.

Planets

spheres of different size that go around the Sun.

Reflect

sunlight bouncing off of a body in space, such as a planet.

Refraction

the bending of light.

Star

a huge ball of very hot gases in space.

Constellation

a pattern of stars, named after a mythological or religious figure, an object, or animal.

Universe

everything that exists, including such things as stars, planets, gas. dust, and energy.

Galaxies

huge gatherings of stars in space plus anything that obits the stars.

Moon Phase

the appearance the moon assumes in the sky, created by sunlight reflecting off of the moon's surface.

Lunar

having to do with the moon.

Asteroids

small planets that revolve around the Sun, some in a belt or band.

Light-years

distance light travels through empty space in one year, equals 5.878 trillion miles.

Sun

a medium sized star at the center of our universe.

Our Solar System

Sun, Mercury, Venus, Earth, Mars (asteroid belt), Jupiter, Saturn, Uranus, Neptune, Pluto (My Very Educated Mother Just Served Us Nine Pizzas.)

rotation

to spin on an axis

revolution

when Earth travels in a closed path around the sun.

orbit

the path one body takes in space as it revolves around another body.

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