Directly above the white streak of Saturn's G ring in the upper right portion of the image, Venus appears at dawn. In the lower part of the image is Saturn's E ring, colored blue due to the light scattered by dust in the ring.
Venus — along with Mercury, Earth, and Mars — is one of the rockier planets in the solar system. Though Venus has an atmosphere of carbon dioxide that reaches nearly 900 degrees Fahrenheit and a surface pressure 100 times that of Earth's, it is considered a twin to our planet because of its similar size, mass, rocky composition, and orbit.
March 4, 2013 3:40 PM PST
Photo by: NASA/JPL-Caltech/Space Science Institute