| Dao Vallis | |
|---|---|
Dao Vallis is the leftmost channel, joined just above the center of the image by Niger Vallis. In each valley water flowed toward the bottom of the image. |
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| Length | 816.0 km |
| Naming | Word for "star" in Thai. |
Dao Vallis is a valley on Mars that appears to have been carved by water. It runs southwestward into Hellas Planitia, and has been identified as an outflow channel.[1] It and its tributary, Niger Vallis, extend for about 1200 km.[2] It is named after the Thai word for star. In the fictional 2007 Canadian miniseries Race to Mars, it is the landing site for Gagarin, the lander, and is the site of science for the mission.
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Dao Vallis begins near a large volcano, called Hadriaca Patera, so it is thought to have received water when hot magma melted huge amounts of ice in the frozen ground. Much of this water may have been released in very large "outburst floods". The partially circular depressions on the left side of the channel in the image below suggests that groundwater sapping also contributed water more gradually.[3]