The moon! Flashcards
When does the moon block the most of the sun during a solar eclipse?
What is the moon & eaths escape velocity
Earth - 11.2 km/s Moon - 2.4 km/s
How much less is the acceleration of gravity on the moon than the earth?
one-sixth earths gravity
What is the distinction between old and new surfaces in the solar system
Old- heavily cratered (has had lots of time to get bonked)
New- Smoother from the lava flow and less time to be cratered
What is a ring of fire eclipse
Why does the same side of the moon always face us
“tidally locked” It’s rotation rate is the same as the time it takes for the earth
How much less is the acceleration of the moon
.16% of earth’s
Why is there no atmosphere on the moon
It’s gravitational force is too weak to maintain it
What is the density of the moon?
3.34 g/cm^3 - same as the denstiy of the crust & outer mantle of the earth
Why is the moons density similar to the earth’s crust
born out of the material surface of the earth (from an impact)
Why did the moon cool quickly
It is small so it cooled quickly (surface area to volume)
What is the first example of understanding the loss of heat dependent to surface area/volume
the moon!
what are the criteria for a world to have a magnetic field
- molten interior
- convection
- moderately rapid rotation
Does the moon have a magnetic field?
No, just remnants from a younger stage
Describe the moons rotation on its axis
Slow, aprox. 30 days. (hence why no magnetic feild
What is the difference in crust between the near and far side of the moon?
Thick crust on far side, thin crust on near side (Marias)
What are the marias?
Deep fractures in the surface of the crust thus that lava pools, likely due to impacts.
What is albedo
Ratio of light reflected to light received
What is the moon’s albedo?
0.07, very low
Who was Robert Hooke?
Shot bullets into mud to prove that the moons craters were impact craters and not volcanic
Why are the moon’s craters not volcanic?
What are ejecta rays?
line streaks from material blasted out of craters
How big are craters in comparison to their original object
Craters are usually 10x grater than the objects that made them
What are scarps
Shrinkage of the surface and it pops
What are garbens
expansion of surface creates a drop-down valley thingy
What are lava flows on the moon called?
Rilles
What is the moons shape
Bulging at the equator bc was rotating faster when created
