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.
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.
Neptune is the eighth planet from the sun, the fourth largest, and a gas planet. It is named after the Roman god of the sea. Neptune is four times the size of Earth, and its day lasts a little more than16 hours. Its year is about 165 Earth years. Neptune's orbit is a perfect circle. The last stop on spacecraft Voyager's epic trip through the solar system was the gas giant Neptune.