Apod Entry 1.5

The photo taken on September 27, is of a whole on Mars. This picture was captured by the Mars Reconnaissance Orbiter which has been surveying Mars for quite some time. The hole is located on the side of the volcano Arsia Mons, which is in the northern territory of the planet. This volcano is quite different from volcanoes on Earth in the aspect that it does not have raised rims that project from the ground and is classified as inactive. Volcanoes such as this one across Mars were earlier identified by visible light and infrared images from shuttles and orbiters. The hole is estimated at 150 meters in diameter and is said to lead to underground tunnels that are partially visible by the sunlight.