Where's Saturn? Cassini Spacecraft Helping Provide More Accurate Planetary Coordinates
Tuesday, February 1, 2011 - 09:01
in Astronomy & Space
Astronomers have had a solid handle on the orbits of our solar system's planets since at least the 17th century, when Johannes Kepler formulated his laws of planetary motion. But the fine details of those orbits are not always obvious, especially for the more distant outer planets, owing to the great distances separating Earth from those worlds and the limited number of spacecraft that have flown in their vicinities. [More]