public void Rule1(float dt, World world)
{
Asteroids = (
(Asteroids).Select(__ContextSymbol8 => new { ___a11 = __ContextSymbol8 })
.Where(__ContextSymbol9 => ((1500f) > (__ContextSymbol9.___a11.Position.Y)))
.Select(__ContextSymbol10 => __ContextSymbol10.___a11)
.ToList<Asteroid>()).ToList<Asteroid>();
}