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Moon


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3500 km
What is the diameter of the Moon (in km)?
384,000 km
What is the distance the Moon is from the Earth (in km)?
27.3 days
How long does it take the Moon to orbit once around the Earth?
29.5 days
How long is a Synodic month? (New Moon to New Moon).
Synodic month
What is the period New Moon to New Moon called?
Mare
What are old and dark areas on the Moon called? (They are iron-richer).
17%
What percentage of the Moon that is "Mare"?
Terra
What is the name of the newer and brighter "highlands" on the Moon?
83%
What percentage of the Moon that is "Terra"?
Sea of Tranquillity
What is near the Sea of Serenity?
Sea of Crises
What is North of the Sea of Tranquillity?
West side
Where on the Moon is the Ocean of Storms?
Craters
What is the effect of impacts from material left over from the Sun's accretion disc?
Tycho, Kepler and Copernicus.
Name three major craters on the Moon.
Mountains
What frequently border the Maria or Seas?
Major mountains
What are the Apennine and Caucasus?
Rilles
What are cracks or clefts on the lunar surface notably near Maria called?
Wrinkle Ridges
What are very long (many km) Ridges of Maria known as?
Rotation of Moon
Synchronous (or captured) rotation which means it keeps the same side or face towards the body it orbits.
Fewer craters, less Mare
What is the far side of the Moon like?
59%
What percentage of the Moon does Libration lets us see?
1/81 th
What is the mass of the Moon compared to that of the Earth?
its smaller gravity
Why does the Moon have no atmosphere? Because of . .
No atmosphere
What is the effect of the Moon's smaller gravity?
ALSEP's
What are used for measuring the distance to the Moon by laser, seismographs to measure moonquakes and sensors to measure solar radiation?
3.8 cm
How far is the Moon moving away each year?
1969 to 1972
When did the Apollo missions land?
Capture Hypothesis
The Moon was captured during a close encounter by earth's gravitational pull.
Co-formation Hypothesis
The Earth and Moon formed in the same nebula.
Fission Hypothesis
A large piece of land flew off the Earth to form the Moon.
Giant Impact Hypothesis
What is the Hypothesis that Theia collided with the Earth and the debris formed the Moon called?
Giant Impact Hypothesis evidence
What do Isotopes of Oxygen, lack of water (vaporised in collision), KREEP rocks show?
Barycentre
Where the Earth and Moon's gravity is balanced?
The Lunar phases
What does the picture show?