I do not know the exact timeframe when I saw this movie ... it could have been between the 1950s and the 1970s. It seems more early to me (especially since I seem to recall it could have been in black and white, though I am not certain about this). It definitely was not in the 1980s.
I remember very little about the plot. There were some astronauts or space travelers on a space craft of some sort, on a mission from Earth. The craft was large and was traveling through space on a journey. While traveling astronauts may have stopped on an alien planet or made contact with some form of alien, perhaps unknowingly. Somehow, these creatures ended up hiding out in the crew's air duct system and/or inner engine workings and laying all of these pulsating alien eggs all over the ship in hidden parts of the ship.
The ship was in deep space, so there was nowhere for the crew to go for help. These eggs multiplied at an incredibly fast rate. I cannot remember how it ends, only that it had me really tense!
Does anyone remember this movie and know the title and the year it was released?
Thank you.