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Day

the time it takes for a planet to make a turn (rotation) on its axis (from one solar noon to another)

Year

the time it takes for a planet to make one revolution around the sun

Lunar month

The time it takes for the moon to revolve one time around the Earth (~29.5 days)

Gravity

the force of attration between all masses; dependent on two things: mass of the objects and distance between objects

Inertia

the tendency of a moving object to continue in a straight line or a stationary object to remain in place unless acted on by an outside force (like gravity)

Sun

A medium-sized star, one of billions, and closest to us (a yellow dwarf star)

Solar System Mnemonic

My Very Eagar Mother Just Served Us Nachos (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune)

Astronomical Unit (AU)

the average distance between the Earth and the Sun, or approximately 150,000,000 km (93 million miles)

Rotation (picture)

Revolution (picture)

Gravity (picture)

shown by line #2

Inertia (Picture)

shown by line #1

Revolution (pic)

shown by line #3

Altitude

the angle of an object (sun, star, etc.) above the horizon

Horizon

where the earth meets the sky

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