e172 Hello From Earth: Australia’s First Interstellar Message

The ‘Hello From Earth’ organizers chose as its communication target a “super-Earth” orbiting the habitable zone of its parent star 20.4 light-years away known as Gliese 581d. The interstellar Tweet was scheduled for August 28, 2009, utilizing three facilities within NASA’s Deep Space Network that together represented the largest and most sensitive scientific telecommunications system in the world.