Bottle throwing aliens ???

Christopher Rose and Gregory Wright from New Jersey have come to a conclusion that intergalactic messages would reach us more efficiently if inscribed on matter.

If energy is what you care about, it's tremendously more efficient to toss a rock.

Christopher Rose

So... the aliens out there should toss us a rock with words "hi, we're here, how are you?"

Read more about this theory on NewScientist.com