Geology Reference
In-Depth Information
(a)
(c)
(b)
Figure 3.30. Images showing morphology of lunar craters as a
function of size: (a) the simple bowl-shaped crater Isidorus D (15 km
in diameter), photographed by the Apollo 16 panoramic camera
(NASA AS16
4502); bright streaks on the wall indicate downslope
movement of fragmental material; (b) an Apollo 11 photograph
(NASA AS11
-
6611) of the 93 km in diameter crater Daedalus on
the lunar far side, showing typical terraced walls, a central mountain
peak, and
-
44
-
floor deposits; and (c) an oblique view from Lunar Orbiter
IV (NASA LO IV M-180) of the Orientale basin; this classic multi-ring
impact structure is some 930 km across.
Figure 3.32. The ejecta from this small (~450m), fresh impact crater is
asymmetric, with the absence of ejecta on the west (left) side
representing the incoming direction of a low-angle impact (NASA
AS15
Figure 3.31. Depth-to-diameter ratios for impact craters on
terrestrial planets (from Sharpton,
1994
).
-
9337).
