Pallas

var mass = [];

var positionX = [];

var positionY = [];

var velocityX = [];

var velocityY = [];

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function setup() {

  createCanvas(windowWidth, windowHeight);

  noStroke();

  fill(64, 255, 255, 192);

}

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function draw() {

  background(32);

  for (var particleA = 0; particleA < mass.length; particleA++) {

    var accelerationX = 0, accelerationY = 0;

    for (var particleB = 0; particleB < mass.length; particleB++) {

      if (particleA != particleB) {

        var distanceX = positionX[particleB] - positionX[particleA];

        var distanceY = positionY[particleB] - positionY[particleA];

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        var distance = sqrt(distanceX * distanceX + distanceY * distanceY);

        if (distance < 1) distance = 1;

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        var force = (distance - 320) * mass[particleB] / distance;

        accelerationX += force * distanceX;

        accelerationY += force * distanceY;

      }

    }

    velocityX[particleA] = velocityX[particleA] * 0.99 + accelerationX * mass[particleA];

    velocityY[particleA] = velocityY[particleA] * 0.99 + accelerationY * mass[particleA];

  }

  for (var particle = 0; particle < mass.length; particle++) {

    positionX[particle] += velocityX[particle];

    positionY[particle] += velocityY[particle];

    ellipse(positionX[particle], positionY[particle], mass[particle] * 1000, mass[particle] * 1000);

  }

}

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function addNewParticle() {

  mass.push(random(0.003, 0.03));

  positionX.push(mouseX);

  positionY.push(mouseY);

  velocityX.push(0);

  velocityY.push(0);

}

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function mouseClicked() {

  addNewParticle();

}

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function mouseDragged() {

  addNewParticle();

}