planets

Question 1

a celestial body moving in an elliptical orbit around a star

Answer 1

planet

Question 2

criteria of a planet

Answer 2

• in orbit around the sun
• has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium shape
• has cleared the neighborhood around its orbit
• not massive enough to induce thermonuclear fusion.

Question 3

relatively small, dense, rocky planets closest to the Sun and their
satellites, and a belt of asteroids, which are small, planet-like bodies
in orbit beyond mars.

Answer 3

Terrestrial Planet

Question 4

have a molten heavy-metal core, few moons and topological

features such as valleys, volcanoes and craters.

Answer 4

Terrestrial Planet

Question 5

large, low density planets farthest from the Sun whose outer layers
are composed mainly of frozen or liquid hydrogen, helium, ammonia
and methane.

Answer 5

Jovian Planet

Question 6

also known as natural satellites — orbit planets and asteroids

Answer 6

Moon

Question 7

Theories on How Moon was Formed

Answer 7

• giant impact model
• synestia
• moonlets
• twin collision

Question 8

classic theory where a Mars-sized rock called Theia smashed into young Earth

Answer 8

giant impact model

Question 9

theia struck the proto earth with enough energy to vaporize both objects forming a new cosmic structure

Answer 9

synestia

Question 10

many smaller impacts created the moon

Answer 10

moonlets

Question 11

theia was made of the same kind of material that the young earth was

Answer 11

twin collision

Question 12

lunar equivalent of earthquake

Answer 12

moonquake

Question 13

kinds of moonquakes

Answer 13

• deep moonquakes (700 km below surface)
• vibrations from impact of meteorites
• thermal quakes
• shallow moonquakes (20 to 30 km below surface)

Question 14

saw 28 of shallow moonquakes between 1972 and 1977

Answer 14

apollo seismic network