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|Number of cells||11|
|Discovered by||John Conway|
|Year of discovery||1970|
The middleweight spaceship (or MWSS for short) is the third most common spaceship (after the glider and lightweight spaceship). It occurs about one fourth as commonly as the LWSS. It was found by John Conway in 1970 and travels at c/2 orthogonally. It can support various non-standard components, such as pushalong 1. It appears in the methuselah 1398M.
- "Spontaneous appeared Spaceships out of Random Dust". Achim Flammenkamp (December 9, 1995). Retrieved on August 18, 2011.
- Middleweight spaceship at the Life Lexicon