lecture 9, september 23, 2010

LECTURE 9, SEPTEMBER 23, 2010

ASTR 101, SECTION 3INSTRUCTOR, JACK BRANDT

jcbrandt@unm.edu

Question 6

a) the Sun’s gravityb) Earth’s magnetic field c) Earth’s tidal forced) the solar winde) the Moon’s magnetic field

What force riveted the Moon’s near side to constantly face Earth?

Question 6

a) the Sun’s gravityb) Earth’s magnetic field c) Earth’s tidal forced) the solar winde) the Moon’s magnetic field

What force rivets the Moon’s near side to constantly face Earth?

Just as the Moon creates tides on Earth with its gravitational force, the

Earth affects the Moon, too.

Because of Earth’s tidal force, the Moon spins once a month.

The principal greenhouse gases in our present atmosphere are

Question 2

a) hydrogen and helium.b) oxygen and nitrogen.c) water vapor and carbon dioxide.d) methane and ammonia.e) sulfuric acid vapor and CO2.

Question 2

a) hydrogen and helium.b) oxygen and nitrogen.c) water vapor and carbon dioxide.d) methane and ammonia.e) sulfuric acid vapor and CO2.

The principal greenhouse gases in our present atmosphere are

A greenhouse gas lets shorter- wavelength light pass through, but absorbs longer-

wavelength light.

Question 8

A planetary atmosphere with ozone could protect surface dwellers from

a) ultraviolet radiation.b) charged particles in the solar wind.c) meteor impacts.d) optical radiation.e) radar waves.

Question 8

A planetary atmosphere with ozone could protect surface dwellers from

a) ultraviolet radiation.b) charged particles in the solar wind.c) meteor impacts.d) optical radiation.e) radar waves.

Ozone in the stratosphere (about 30-50 km high) absorbs UV light, and heats the upper

atmosphere.

Question 7

Lunar maria are found

a) uniformly all over the Moon.b) mostly on the side facing Earth.c) mostly on the far side of the Moon.d) only in the dark areas, out of sunlight.e) in the highlands, among mountains.

Question 7

Lunar maria are found

a) uniformly all over the Moon.b) mostly on the side facing Earth.c) mostly on the far side of the Moon.d) only in the dark areas, out of sunlight.e) in the highlands, among mountains.

Because the Moon keeps its near side always facing Earth, that side has a

thinner crust, and is also less cratered.

The region around Earth where the magnetic field traps charged particles is the

Question 4

a) ozone layer.b) exosphere.c) Van Allen radiation belts.d) corona.e) aurora borealis and australis.

The region around Earth where the magnetic field traps charged particles is the

Question 4

a) ozone layer.b) exosphere.c) Van Allen radiation belts.d) corona.e) aurora borealis and australis.

The Earth’s magnetosphere influences the charged particles

of the solar wind.

Some particles are channeled toward the poles, creating the

aurora.

ASTR 101-2, SPRING 2006

Question 10

Today, which of these theories best explains the Moon’s origin?

a) The fission theoryb) The giant impact theoryc) The capture theoryd) The co-formation theorye) The fusion theory

Question 10

Today, which of these theories best explains the Moon’s origin?

a) The fission theoryb) The giant impact theoryc) The capture theoryd) The co-formation theorye) The fusion theory

The giant impact theory seems to explain why the Moon is similar to Earth’s mantle, and why it doesn’t have a dense core.