earth, moon, and sun
by gia didomenico
earth in space
how does earth move in space?
earth moves through space in two major ways; rotation and revolution.
what causes the cycle of seasons on earth?
earth has seasons because its axis is tilted as it revolves around the sun
gravity and motion
Newton concluded that two factors - inertia and gravity - combine to keep Earth in orbit around the sun and the moon in orbit around earth.
what determines the strength of the force of gravity between two objects?
the strength of the force of gravity between two objects depends on the two factors; the masses of the objects and the distance between them.
what two factors combine to keep the moon and earth in orbit?
phases, eclipses, and tides
what causes the phases of the moon?
the changing relative positions of the moon, earth, and sun cause the phases of the moon, eclipses, and tides.
what are solar eclipses?
a solar eclipse occurs when the moon passes directly between earth and the sun, blocking sunlight from earth.
what are lunar eclipses?
during a lunar eclipse, earth blocks sunlight from reaching the moon.
what causes the tides?
tides are caused mainly by differences in how much the moon's gravity pulls on different parts of the earth.
what features are found on the moon?
features on the moon's surface include maria, craters, and highlands
what are some characteristics of the moon?
the moon is dry and airless. compared to earth, the moon is small and has large variations in its surface temperature.
Scientists theorize a planet-sized object collided with earth to form the moon.
how did the moon form?
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