Trans-Neptunian object

Trans-Neptunian object

Fig. 15.7 . In this artistís visualization, a small, cold trans-Neptunian object dubbed Sedna is shown where it resides at the outer edges of our solar system, beyond the orbit of Neptune. The object is so far away that the Sun appears as an extremely bright star instead of the large, warm disc observed from Earth. A distant, hypothetical small moon is shown above the object and nearly in the direction of the Sun. (Courtesy of NASA/JPL.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University