Pre-pulsar spaceship
Pre-pulsar spaceship | |||||||
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Pattern type | Spaceship | ||||||
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Number of cells | 128 | ||||||
Bounding box | 73 × 14 | ||||||
Direction | Orthogonal | ||||||
Period | 30 | ||||||
Mod | 30 | ||||||
Speed | c/5 | Unknown | ||||||
Heat | 131.5 | ||||||
Discovered by | David Bell | ||||||
Year of discovery | 1998 | ||||||
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Pre-pulsar spaceship (or PPS for short) is any of three different period 30 c/5 orthogonal spaceships in which a pre-pulsar is pushed by a pair of spiders. The back sparks of these spaceships can be used to perturb gliders in many different ways, allowing the easy construction of c/5 puffers.
The first pre-pulsar spaceship, the symmetric pre-pulsar spaceship (or SPPS for short, shown to the right) was found by David Bell in May 1998 and was based on the P15 pre-pulsar spaceship found by Noam Elkies in December 1997.
The asymmetric pre-pulsar spaceship (or APPS for short, shown below) was found by Alan Hensel, also in May 1998, based on a skewed version of the pre-pulsar.
The third period 30 pre-pulsar spaceship, shown below, is similar to the symmetric pre-pulsar spaceship but contains an extra T-tetromino between the spiders and is glide symmetric.
Image gallery
External links
- Pre-pulsar spaceship at the Life Lexicon
- Patterns
- Spaceships with between 120 and 129 cells
- Periodic objects with minimum population between 120 and 129
- Patterns with between 120 and 129 cells
- Patterns found by David Bell
- Patterns found in 1998
- Spaceships
- Spaceships with period 30
- Orthogonal spaceships
- Spaceships with speed c/5
- Spaceships with heat between 130 and 139
- Spaceships with mod 30
- Patterns with bilateral orthogonal symmetry
- Patterns found by Alan Hensel
- Non-monotonic spaceships