Which of these is NOT now on the surface of Mars?
A) Mars Global Surveyor
B) Viking 1
C) Pathfinder
D) Sojourner
E) Spirit
Question 2
As the Sun rotates, an individual sunspot can be tracked across its face. From eastern to western limb, this takes about
A) 12 hours.
B) a week.
C) two weeks.
D) a month.
E) 5.5 years.