... Sagittarius Star Cloud . ... Stars come in all different colors. The color of a star indicates its surface temperature, an important property used to assign each star a spectral type. Most stars in the above Sagittarius Star Cloud are orange or red and relatively faint, as our Sun would appear. The Wind on Mars . ... Wind erosion has been discovered on Mars. ... The Earth's orbit is not a perfect, sun-centered circle. ... Venus Once Molten Surface . ... A New Jupiter Oval Rotates . ...