Antoine is a molecular exo-biologist on his way to a planet orbiting a star that

Question

Antoine is a molecular exo-biologist on his way to a planet orbiting a star that is exactly 7 light years away from Earth to begin studying the suitability of the planet to support human life. He is eager to begin work as he says goodbye to his family and boards the spaceship for the long journey ahead. When Antoine arrives at his destination he wants to send a message back to Earth to let everyone know he’s okay. If Antoine’s message is sent via tight-beam laser communication, how long will it take Antoine’s family to receive the message after he sends it?

Explanation / Answer

It will take exactly 7 years for Antoine's message to reach Earth since 1 light year is a unit of distance that light travels in a year and the distance between Antoine's new planet and Earth is 7 light years that means communication-based on light should take 7 years in time to reach Earth.

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