Continuity mistake: As the alien struggles with the security personnel, it's easy to tell the alien actor and the stunt double. The hair color and style change between distance and close up shots.
Revealing mistake: As Koenig tells of the attack, his feet are passing by the "dead" Mike Baxter. As they pass, Baxter's eyes flicker for a second.
Factual error: In Mike's quarters, the poster of the Lunar Lander appears to have the Lander oriented incorrectly.
Answer: Not necessarily - The gravitational fields of Earth and the Sun could have deflected the moon away from the solar system.
Seniram