Mission to Mars

Across

1The _______ series of spacecraft were interplanetary probes designed to investigate Mars, Venus, and Mercury (7)
5A fissure in the earth's crust (or in the surface of some other planet) (7)
9A shade of brown with a tinge of red (5)
10A sweet food made from sugar or chocolate (5)
11Be seated (3)
12Anger (3)
13A plant fiber used for making rope (5)
14A drama set to music (5)
15A daughter or your brother or sister (5)
17Topic (7)
19An ornamental design made of strips of wood or metal (7)
20An object such as an animal or plant serving as the emblem of a family or clan especially among American Indians (5)
22Mars has two tiny ____, Deimos and Phobos (5)
24An exploratory action or expedition (5)
26And not; neither (3)
27Determine the sum of (3)
28Representative of a federal agency or bureau (5)
29A native or inhabitant of Iraq (5)
30_______ Mons is three times taller than Mt. Everest (7)
31Detect with the senses (7)

Down

1We may refer to a space exploration expedition as a "_______" (7)
2To act or speak on behalf of somebody or something (9)
3Move towards; draws closer to (5)
4Type of gene (9)
5Used especially for floor coverings (5)
6Put down (3)
7Passageway between seating areas as in an auditorium (5)
8Excluded from a society (7)
14The path described by one celestial body in its revolution about another (5)
16Moves out of; as of a room, a bus, etc. (5)
17Held up or having the weight borne especially from below (9)
18Lessen or to try to lessen the seriousness or extent of (9)
19Backache (7)
21Of or relating to the planet Mars (or its fictional inhabitants) (7)
23In a manner differing from the usual or expected (5)
24A machine used for printing (5)
25Long narrative poems telling of a hero's deeds (5)
28Egyptian cobra (3)