The Curiosity Rover has recently landed on Mars and likes to send Twitter updates on its progress. If a tweet is posted 14 minutes after it was sent, how far is Curiosity from Earth?
Given 1 min = 60 s
time (t) = 20 minutes * 60s/min = 1200s
Distance (D) = Velocity (v) * t
v = Speed of light = 3 x 10⁸ m/s
D = 3E8 x 1200
D = 3.6E11 m
Curiosity is 3.6E11 m from Earth.
D = 3.6E11 m