The Voyager I spacecraft is currently 18 billion km from Earth and heading out of our Solar System. How long does it take radio messages from Voyager I to reach us?
A) 1.7 days
B) 17 hours
C) 17 days
D) 17 weeks
E) 17 minutes

Question

Quizplus · Accepted Answer

The speed of light is approximately 300,000 km/s, so it would take approximately 17 hours for a radio message to travel the 18 billion km distance between Voyager I and Earth. Therefore, choice B (17 hours) is the correct answer.

The Voyager I Spacecraft Is Currently 18 Billion Km from Earth