Space rake
```
x = 22, y = 19, rule = B3/S23
11b2o5b4o$9b2ob2o3bo3bo$9b4o8bo$10b2o5bo2bo2$8bo$7b2o8b2o$6bo9bo2bo$7b
5o4bo2bo$8b4o3b2ob2o$11bo4b2o4$18b4o$o2bo13bo3bo$4bo16bo$o3bo12bo2bo$b
4o!
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```

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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

Space rake is a period 20 forward glider rake constructed no later than 1971 ,^{[1]} 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.

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.^{[2]}

```
x = 23, y = 20, rule = b3/s23
12b2o5b4o$10b2ob2o3bo3bo$10b4o8bo$11b2o5bo2bob2$9bo13b$8b2o8b2o3b$7bo
9bo2bo2b$8b5o4bo2bo2b$9b4o3b2ob2o2b$12bo4b2o4b4$19b4o$18bo3bo$b4o17bo$
o3bo13bo2bob$4bo18b$o2bo!
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```

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The backward version of the space rake(click above to open LifeViewer ) RLE : here Plaintext : here

References
External links