THEMIS observes possible cave skylights on Mars
Article first published online: 15 SEP 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 17, September 2007
How to Cite
2007), THEMIS observes possible cave skylights on Mars, Geophys. Res. Lett., 34, L17201, doi:10.1029/2007GL030709., , , and (
- Issue published online: 15 SEP 2007
- Article first published online: 15 SEP 2007
- Manuscript Accepted: 14 AUG 2007
- Manuscript Revised: 23 JUL 2007
- Manuscript Received: 16 MAY 2007
 Seven possible skylight entrances into Martian caves were observed on and around the flanks of Arsia Mons by the Mars Odyssey Thermal Emission Imaging System (THEMIS). Distinct from impact craters, collapse pits or any other surface feature on Mars, these candidates appear to be deep dark holes at visible wavelengths while infrared observations show their thermal behaviors to be consistent with subsurface materials. Diameters range from 100 m to 225 m, and derived minimum depths range between 68 m and 130 m. Most candidates seem directly related to pit-craters, and may have formed in a similar manner with overhanging ceilings that remain intact.