Aries

From Slackerpedia Galactica

Aries is one of the thirteen constellations of the zodiac lying between Taurus and Pisces. Aries contains very few bright stars but most are visible to the naked eyes. When shepherds connected all the visible stars they could see in ancient times from dark skies, Aries resembled a ram. From our more light polluted skies, it resembles a fairly empty area along the ecliptic.

Maybe it's ET's finger as he reaches out to say "I'll be right here."