Social robots have been developed on Earth since the 1990s. This article shows that they can also provide added value in space – particularly on a manned flight to Mars. The focus in this paper is on wearable social robots, which seem to be an obvious type due to their small size and low weight. First, the environment and situation of the astronauts are described. Then, using AIBI as an example, it is shown how it fits into these conditions and requirements and what tasks it can perform. Possible further developments and improvements of a wearable social robot are also mentioned in this context. It becomes clear that a model like AIBI is well suited to accompany astronauts on a Mars flight. However, further developments and improvements in interaction and communication are desirable before application.