Janssen (Martian crater)

Janssen Crater is an impact crater in the Arabia quadrangle on Mars at 2.7° N and 322.4° W. and is 154 km in diameter. Its name was approved in 1973, and refers to French astronomer Pierre Janssen. Some close up images of the crater reveal layers in a floor deposit. A picture below show these layers, as well as dark slope streaks. The darker the streak, the younger it is. The layers on the floor of Janssen may have been formed on the bottom of lakes.

This article is about the crater on Mars. For the crater on the Moon, see Janssen (lunar crater).
Janssen Crater
Location of Janssen Crater
PlanetMars
RegionArabia quadrangle
Coordinates2.7°N 37.6°E / 2.7; 37.6
QuadrangleArabia
Diameter154 km
EponymPierre Janssen
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