A significantly large asteroid, or small moon/planetoid, became embedded in the underside of the city-sized JMC mining spaceship Red Dwarf at some point in the early years of its mission, and remained one of its most prominent external features. The asteroid was already present before Red Dwarf left Earth's solar system, and was still embedded in the underside of the ship three million years later.
The background or purpose of the asteroid is unclear. In the early television series, the model of the ship made it appear as though the inclusion of the asteroid was fairly jagged, implying that it had impacted into the underbelly of Red Dwarf.
Since it was a mining ship, it is possible and even likely that the inclusion of the asteroid into Red Dwarf was not a result of meteor impacts, but was deliberate and intentional on the part of the JMC. This would have given the crew a continual source of ore to mine from within the ship as they went on their rounds around the solar system. This appears more so in the remastered version of the ship, and also in the nanobot-upgraded ship of Series VIII, where it seems as though the ship had been constructed around two separate asteroids or that space had been made in the ships design to take in, mine and then discard such asteroids.
From season 10 onward Red Dwarf had one large asteroid embedded in its underside with several small asteroids around it. The hull of the ship surrounding the large and small asteroids shows clear signs of impact damage implying the presence of these rocks in the ships structure was from an accidental impact.
- Early concept artwork for Red Dwarf (some of which can be seen in reconstructed episodes such as "Bodysnatcher" and "Dad") show that the two asteroids were originally to have been much bigger before the model was built, with the ship itself shaped by the contours of the asteroids. This would suggest that the asteroids had been there from the ship's construction. When the model was built it retained the asteroids, but however toned them down in size and prominence somewhat.
- Prop maker Peter Wragg, who designed the model for Red Dwarf, said in an interview that the asteroids were a deliberate design choice to make the ship appear much older and more traveled. They were meteorites which had embedded themselves into the ship, and the ship owners had merely decided to leave them there.