From: J.E. Robinson, et101.life
The Moon or Mars are close enough for a space station or base and would likely be hard to detect by a technologically advanced society from Earth in the 21st. century.
Contact with non-human intelligent species
Contact with non-human intelligent species
From: J.E. Robinson, et101.life
The Moon or Mars are close enough for a space station or base and would likely be hard to detect by a technologically advanced society from Earth in the 21st. century.