Scheduled air date: 1999 May 03-09
Mars is still at about its closest to the Earth, and is very bright in the Southeast evening sky. It will soon become noticeably fainter (and smaller in a telescope) as it continues to move away from Earth.
(Shown at 10:00pm for mid-Northern latitudes.)
Mars is home to the Solar System's largest canyon, 2500 mile-long Mariner Valley (left), and the largest mountain, 15 mile-high Olympus Mons (right).
Malin Space Science Systems/NASA image
Not far from the giant volcano Olympus Mons (near center of above image) are three smaller volcanoes, Arsia Mons, Pavonis Mons and Ascraeous Mons. These three are in a straight, evenly-spaced row (seen to the lower right of Olympus Mons).
If you wish to view illustrations for other episodes, please see our Star Gazer Illustrated directory.
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