If a star has a parallax of 0.05, then its distance in light-years is about
A) 6.4 light-years.
B) 12.7 light-years.
C) 20 light-years.
D) 65 light-years.
E) 100 light-years.
Question 2
How is a technical civilization defined?
A) a civilization that can avoid self-destruction for long periods
B) a civilization that can communicate over interstellar distances
C) a civilization that has the ability to store and process information
D) a civilization that has developed interplanetary space travel
E) a civilization that can construct tools out of raw materials
