Observations - Lunar 100

L	Click Image for view of each feature	Feature name	Significance	Diameter (km)
1		Moon	Large satellite	3,476
2		Earthshine	Twice reflected Sunlight
3		Mare/highland dichotomy	Two materials with distinct compositions
4		Apennines	Imbrium basin rim	400
5		Copernicus	Archetypal large complex crater	93
6		Tycho	Large rayed crater with impact melts	102
7		Altai Scarp	Nectaris basin rim	425
8		Theophilus, Cyrillus, Catharina	Crater sequence illustrating stages of degradation	110
9		Clavius	Lacks basin featrues in spite of its size	245
10		Mare Crisium	Mare contained in large circular basin	540
11		Aristarchus	Very bright crater with dark bands on its walls	40
12		Proclus	Oblique-impact rays	28
13		Gassendi	Floor-fractured Crater	101
14		Sinus Iridium	Very large crater with missing rim	260
15		Straight Wall	Best example of a lunar fault	130
16		Petavius	Crater with domed and fractured floor	188
17		Schröter's Valley	Giant sinuous rille	168
18		Mare Serenitatis dark edges	Distinct mare areas with different compositions
19		Alpine Valley	Lunar graben	165
20		Posidonius	Floor-fractured crater	95
21		Fracastorius	Crater with subsided and fractured floor	112
22		Aristarchus Plateau	Mysterious uplifted region mantled with pyroclastics	150
23		Pico	Isolated Imbrium basin-ring fragment	25
24		Hyginus Rille	Rille containing rimless collapse pits	220
25		Messier and Messier A	Oblique ricochet-impact pair	11
26		Mare Frigoris	Arcuate mare of uncertain origin	1,600
27		Archimedes	Large crater lacking central peak	83
28		Hipparchus	Subject of first drawing of a single crater	150
29		Aridaeus Rille	Long, linear graben	250
30		Schiller	Possible oblique impact	180
31		Taruntius	Young floor-fractured crater	56
32		Arago Alpha and Beta	Volcanic domes	26
33		Serpentine Bridge	Basin inner-ring segment	155
34		Lacus Mortis	Strange crater with rille and ridge	152
35		Triesnecker Rilles	Rille Family	215
36		Grimaldi basin	A small two-ring basin	410
37		Bailly	Barely discernible basin	303
38		Sabine and Ritter	Possible twin impacts	30
39		Schickard	Crater floor with Orientale basin ejecta stripe	206
40		Janssen Rille	Rare examle of a highland rille	199
41		Bessel ray	Ray of uncertain origin near Bessel
42		Marius Hills	Complex of volcanic domes and hills	125
43		Wargentin	A crater filled to the rim with lava or ejecta	84
44		Mersenius	Domed floor cut by secondary craters	84
45		Maurolycus	Region of saturation cratering	114
46		Regiomontanus central peak	Possible volcanic peak	108
47		Alphonsus dark spots	Dark-halo eruptions on crater floor	119
48		Cauchy region	fault, rilles and domes	130
49		Gruithuisen Delta and Gamma	Volcanic domes formed with viscous lavas	20
50		Cayley Plains	Light, smooth plains of uncertain origin	14
51		Davy crater chain	Result of comet-fragment impacts	34
52		Crüger	Possible volcanic caldera	45
53		Lamont	Possible buried basin	106
54		Hippalus Rilles	Rilles concentric to Humorum basin	240
55		Baco	Unusually crater floor and surrounding	69
56		Mare Australe	A partially flooded ancient basin	132
57		Reiner Gamma	Conspicuous swirl and magnetic anomaly	70
58		Rheita Valley	Basin secondary-crater chain	445
59		Schiller-Zucchius basin	Badly degraded overlooked basin	335
60		Kies Pi	Volcanic dome	45
61		Mösting A	Simple crater close to center of lunar near side	13
62		Rümker Hills	Large volcanic dome	70
63		Imbrium sculpture	Basin ejecta near and overlying Bscovich and Julius Caesar
64		Descartes	Apollo 16 landing site; putative region of highland volcanism
65		Hortensius domes	Dome field north of Hortensius	10
66		Hadley Rille	Lava channel near Apollo 15 landing site
67		Fra Mauro formation	Apollo 14 landing site on Imbrium ejecta
68		Flamsteed P	Proposed young volcanic crater, Surveyor 1 landing site
69		Copernicus secondary craters	Rays and craterlets	4
70		Humbodtianum basin	Multi-ring impact basin	650
71		Sulpicius Gallus dark mantle	Ash eruptions northwest of crater	12
72		Atlas dark-halo craters	Explosive volcanic pits on the floor of Atlas	87
73		Smythii basin	Difficult-to-observe basin scarp and mare	740
74		Copernicus H	Dark-halo impact crater	5
75		Ptolemaeus B	Saucerlike depression on the floor of Ptolemaeus	164
76		W. Bond	Large crater degraded by Imbrium ejecta	158
77		Sirsalis Rille	Procellarum basin radial rilles	425
78		Lambert R	A buried "ghost" crater	54
79		Sinus Aestuum	Eastern dark-mantle volcanic deposit	90
80		Orientale basin	Youngest large impact basin	930
81		Hesiodus A	Concentric crater	15
82		Linné	Small crater once thought to have disappeared	2.4
83		Plato craterlets	Crater pits at limits fo detection	109
84		Pitatus	Crater with concentric rilles	97
85		Langrenus rays	Aged ray system	132
86		Prinz Rilles	Rille system near the crter Prinz	46
87		Humboldt	Crater with central peaks and dark spots	189
88		Peary	Difficult-to-observe polar crater	104
89		Valentine Dome	Volcanic Dome	30
90		Armstrong, Aldrin and Collins	Small craters near the Apollo 11 landing site	3
91		De Gasparis Rilles	Area with many rilles	30
92		Gylden Valley	Part of the Imbrium radial sculpture	47
93		Dionysius rays	Unusual and rare dark rays	18
94		Drygalski	Large south-pole region crater	149
95		Procellarum basin	The Moon´s biggest basin?	3,200
96		Leibnitz Mountains	Rim of South Pole-Aitken basin
97		Inghirami Valley	Orientale basin ejecta	140
98		Imbrium lava flows	Mare lava-flow boundaries
99		Ina caldera	D-shaped young volcanic caldera	3
100		Mare Marginis swirls	Possible magnetic field-deposits