Reference no: EM133292811

1. Why is magnetic field on a planet important for habitability?

a. It protects the ozone layer

b. It protects from runaway greenhouse effect

c. It protects from the solar wind

d. It regulates the CO_2 cycle

2. Most likely the loss of atmosphere of Mars was aided by

a. runaway greenhouse effect

b. asteroid impacts

c. solar wind

d. volcanic activity

3. Where is the farthest a spacecraft has gone?

a. to Pluto

b. in the interstellar space outside the solar system

c. to Kuiper belt

d. to our nearest star

4. One way to define the edge of the solar system is based on

a. X-rays from the Sun

b. the Sun's brightness

c. the Sun's magnetic field

d. the edge of the Kuiper belt