Pisces, a constellation and the 12th sign of the zodiac. The name means The Fishes. Pisces contains no bright stars. It is bounded by Andromeda on the north, Pegasus on the north and west, Aquarius on the west and south, Cetus on the south and east, and Aries and Triangulum on the east. The vernal equinox, the point where the sun crosses the celestial equator at the beginning of spring, is in Pisces.
It's tough to wrap your mind around a time when the Earth wasn't here. So how do Earth and the rest of the planets out there get their start in the universe?
A billion years ago, the moon stopped being geologically active. But that's not to say that the moon is doing nothing for us. Let's find out why we owe our moon some thank-yous.