ASTR HW 7 (Lecture 8 and 9)

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Before starting these questions, please watch Lectures 8 and 9. You must submit them at one time. The submit button is at the bottom. Please only submit once.

Mars is often considered interesting to study because *

1 point

its geological history implies that, in the past, its surface conditions and atmosphere were much more Earth-like.

its geological history implies that, in the past, its surface conditions and atmosphere were much more Venus-like.

it has copious amounts of bauxite which is being mined.

there is evidence that microbes live on its surface.

Mars *

1 point

has no atmosphere.

currently has lots of liquid water on its surface.

has an Earth-like magnetic field.

once had lots of liquid water on its surface.

Which of the following problems will be faced by astronauts landing on Mars? (Please select one.) *

1 point

The Solar wind will harm astronauts.

The ultraviolet radiation emitted by Mars will harm the astronauts.

The X-Rays emitted by Mars will harm the astronauts.

The low-gravity environment throughout the trip will degrade the astronauts' bones, ligaments, tendons, and muscles.

Mars is 50% farther from the Sun than is Earth, and thus it gets *

1 point

1/(3/2)^2 = 1/(9/4) = 4/9 = about 44% of the light that Earth gets.

1/(3/2) = 2/3 = about 67% of the light that Earth gets.

1/(50)^2 = 1/(2500) = less than 1% of the light that Earth gets.

about 50% of the light that Earth gets.

Pluto (please select all that apply) *

1 point

has enough self-gravity to form a round shape.

does not have enough self-gravity to form a round shape.

does not orbit in the plane of the Solar System, unlike the eight planets.

does orbit in the plane of the Solar System.

Required

Short period comets tend to originate in the *

1 point

the Kuiper Belt.

the asteroid belt.

the Oort cloud.

halo of the galaxy.

If the Moon were 1 mile from Earth, how far from Earth would Mars be? *

1 point

200 miles

10 miles

1300 miles

43 miles

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