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6 - Astronomy
closest planet to the sun
rocky planet with water
outer planets (Jupiter, Saturn, Uranus, Neptune)
inner planets (Mercury, Venus, Earth, Mars)
force that keeps the planets in motion around the sun
satellite that revolves around a planet
move in a circular motion around another object
small body that revolves around the sun but cannot move other objects away from its orbital neighborhood
day and night
caused by Earth's rotation
caused by the tilt of the Earth
lit up crescent on the right
1st quarter moon
lit up on the right half of the moon that we can see.
almost all of the moon is lit up from the right to the left, except a small bit on the left.
a phase of the moon where all of the moon that we can see is lit up and visible.
all of the moon is lit up except for a small bit on the right side of the moon that we can see.
third quarter moon
left half of the moon that we can see is lit up.
only the left sliver of the moon is visible and has a crescent shape
no visible moon because the sun shines only on the side facing away from earth
when the moon blocks the sun
when the earth casts a shadow on the moon
4.5 billion years
approximate age of Earth
Earth considered the center of the universe
had a geocentric model of the solar system
thought movement of planets and stars was circular
the sun is the center of the solar system
heliocentric model of solar system, Earth rotates on its axis
was imprisoned for proving the heliocentric model