@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + (colonized ? 1231 : 1237);
		result = prime * result + (containsRobot ? 1231 : 1237);
		result = prime * result
				+ ((elements == null) ? 0 : elements.hashCode());
		result = prime * result + ((holes == null) ? 0 : holes.hashCode());
		result = prime * result + (homePlanet ? 1231 : 1237);
		result = prime * result + ((name == null) ? 0 : name.hashCode());
		result = prime * result + ((rocks == null) ? 0 : rocks.hashCode());
		result = prime * result + (scanned ? 1231 : 1237);
		return result;
	}