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6 - Astronomy

STUDY
PLAY
Mercury
closest planet to the sun
Earth
rocky planet with water
gas planets
outer planets (Jupiter, Saturn, Uranus, Neptune)
rocky planets
inner planets (Mercury, Venus, Earth, Mars)
gravity
force that keeps the planets in motion around the sun
moon
satellite that revolves around a planet
rotate
spin
revolve
move in a circular motion around another object
dwarf planet
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
seasons
caused by the tilt of the Earth
waxing
growing
waning
shrinking
waxing crescent
lit up crescent on the right
1st quarter moon
lit up on the right half of the moon that we can see.
waxing gibbous
almost all of the moon is lit up from the right to the left, except a small bit on the left.
full moon
a phase of the moon where all of the moon that we can see is lit up and visible.
waning gibbous
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.
waning crescent
only the left sliver of the moon is visible and has a crescent shape
new moon
no visible moon because the sun shines only on the side facing away from earth
solar eclipse
when the moon blocks the sun
lunar eclipse
when the earth casts a shadow on the moon
4.5 billion years
approximate age of Earth
geocentric
Earth considered the center of the universe
Ptolemy
had a geocentric model of the solar system
Aristotle
thought movement of planets and stars was circular
heliocentric
the sun is the center of the solar system
Copernicus
heliocentric model of solar system, Earth rotates on its axis
Galileo
was imprisoned for proving the heliocentric model