Difference between revisions of "Pre-pulsar spaceship"
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[[Martin Grant]]'s 601-glider [[spider]] synthesis resulted in a 1212-glider [[glider synthesis|synthesis]] for the symmetric pre-pulsar spaceship on March 8, {{year|2019}}.<ref name="post72731" /> | [[Martin Grant]]'s 601-glider [[spider]] synthesis resulted in a 1212-glider [[glider synthesis|synthesis]] for the symmetric pre-pulsar spaceship on March 8, {{year|2019}}.<ref name="post72731" /> | ||
In June 1997, David Bell found reactions to convert between the symmetric and glide-symmetric forms of the p30 pre-pulsar spaceship. | |||
==Image gallery== | ==Image gallery== | ||
Revision as of 11:46, 7 June 2019
| 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 | 6c/30 | ||||||||
| 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.
Martin Grant's 601-glider spider synthesis resulted in a 1212-glider synthesis for the symmetric pre-pulsar spaceship on March 8, 2019.[1]
In June 1997, David Bell found reactions to convert between the symmetric and glide-symmetric forms of the p30 pre-pulsar spaceship.
Image gallery
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References
- ↑ Adam P. Goucher (March 8, 2019). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
External links
- Pre-pulsar spaceship at the Life Lexicon
- 128P30H6V0.1 at Heinrich Koenig's Game of Life Object Catalogs
- 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
- Patterns that can be constructed with 1,000 or more gliders
- Spaceships
- Spaceships with period 30
- Orthogonal spaceships
- Spaceships with speed c/5
- Spaceships with unsimplified speed 6c/30
- Spaceships with heat between 130 and 139
- Spaceships with mod 30
- Patterns with bilateral orthogonal symmetry
- Patterns found by Alan Hensel
- Non-monotonic spaceships