Space rake

Space rake is a period 20 forward glider rake constructed around 1971, probably by Bill Gosper; it was the first known rake. It consists of an ecologist with a lightweight spaceship added to turn its dying debris into gliders.

Space rake
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Pattern type Rake
Puffer
Number of cells 65
Bounding box 22×19
Direction Orthogonal
Period 20
Speed c/2
Discovered by Unknown
Year of discovery Unknown

Note that if the back lightweight spaceship is flipped vertically and moved down by one cell, then this becomes a period 20 backward glider rake, as shown below.[1]

The backward version of the space rake
RLE: here
gollark: Yes, I am.
gollark: Twitter, but you can pick exactly four messages.
gollark: Imagine the amount of users.
gollark: And?
gollark: Such as?

References
  1. Alan Hensel's lifep.zip pattern collection.
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