| A | B |
|---|
| surface | the outside part of something |
| spacecraft | a vehicle for traveling into space |
| lunar | relating to the moon |
| visible | able to be seen |
| footprint | a mark made by a foot |
| discovered | found or learned for the first time |
| distant | far away in space or time |
| voyage | a long trip by water, over land, or through space |
| signal | a sign that gives a command |
| vast | very large in size or amount |
