Moon Phases Flashcards
The spinning of Earth on its axis
Rotation
The movement of one object around another
Revolution
A planet sized object collided with Earth to form the moon
Collision Ring Theory
A device used to observe distant objects by making them appear closer
Telescope
Telescopes that have a mirror
Reflecting
Telescopes with objective lenses
Refracting
Dark, flat areas on the moon made of hardened rock formed from lava flows that occurred 3-4 billion years ago
Maria
Lighter, rough mountain areas of the moon
Highlands
Bowl shaped areas created by the impact of meteoroids (small chunks of rock from space)
Crater
The moon rotates ____ for every revolution around the Earth, so we never see the far side of the moon
Once
Different shapes of the moon you see from Earth
Phases
When the moon passes directly between the Earth and the sun, blocking sunlight from Earth. The moon’s shadow hits Earth.
Solar Eclipse
When Earth blocks sunlight from reaching the moon
Lunar Eclipse
During a total lunar eclipse, the moon is in earth’s _____
Umbra
The darkest part of the moon or Earth’s shadow
Umbra
The largest part of the shadow
Penumbra
The force of _______ pulls the moon and Earth towards each other.
Gravity
The sun, moon, and Earth are in line during a new moon. The gravity of the sun and the moon pull in the same direction. Their combined forces produce a tide with the greatest difference between consecutive low and high tides. Occurs twice a month during new and full moon.
Spring tide
Occurs twice a month during 1st and 3rd quarter phases. The line between the Earth and sun is at a right angle to the line between the Earth and the moon, which produces tide that has the least difference between consecutive low and high tides.
Neap tide
The force that attracts all objects towards each other
Gravity
Every object in the universe attracts every other object.
Newton’s law of universal attraction
The strength of gravity depends on the ____ of objects and the ________ between the objects.
Mass, distance
The tendency of an object to resist a change in motion. The greater the mass, the greater the _______. (Also known as Newton’s 1st law of motion)
Inertia
_______ and _______ combine to keep Earth in orbit around the sun and the moon in orbit around the Earth.
Gravity, Inertia
