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Discovered in 2007, Gliese 581 d is a planet that scientists have speculated could be habitable. It is approximately 20 light years away from Earth and is classified as a super-Earth because it is about 6 to 13 times more massive. It appears to be on the outskirts of, but still within, its star’s habitable zone, meaning that it could have liquid water oceans. In 2009, messages were sent in the direction of Gliese 581 d. What is the minimum amount of time it would take for a response to arrive?
Source: The Free Dictionary