Heavyweight spaceship

	Heavyweight Spaceship
	<a href="/wiki/File:Hwss.png" class="image" title="Heavyweight Spaceship image"><img alt="Heavyweight Spaceship image" src="/w/images/2/22/Hwss.png" decoding="async" width="146" height="114" /></a>
	<a href="/wiki/File:Hwss.png" class="image" title="Heavyweight Spaceship image"><img alt="Heavyweight Spaceship image" src="/w/images/2/22/Hwss.png" decoding="async" width="146" height="114" /></a>
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Pattern type	Spaceship
Number of cells	13
Bounding box	7 × 4
Direction	Orthogonal
Period	4
Mod	Unknown
Speed	c/2 \| Unknown
Heat	19
Discovered by	John Conway
Year of discovery	1970
Rules
Outer-totalistic rules	B3/S23 – B3468/S23
# of rules	23 = 8
Glider synthesis
Fewest gliders	3
Uploaded synthesis RLE	hwss_synth.rle
Pattern files
Plaintext	hwss.cells
RLE	hwss.rle

The heavyweight spaceship (or HWSS for short, or big fish) is the fourth most common spaceship (after the glider, lightweight spaceship and middleweight spaceship). It was found by John Conway in 1970 and travels at a speed of c/2 orthogonally. Its domino spark can be used to stabilize several tagalongs, including sidecar and half of x66. It is one of only three known spaceships that is a polyomino in any of its phases.

Commonness

The HWSS is the thirty-fifth most common object on Adam P. Goucher's Catagolue.^[1]

The Heavyweight spaceship eaters