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HTML

<!DOCTYPE html>

<head>

<title>Universe Formation Simulation</title>

<style>

html, body {

margin: 0;

overflow: hidden;

background: black;

}

canvas {

display: block;

}

</style>

</head>

<body>

const canvas = document.getElementById('universe');

const ctx = canvas.getContext('2d');

canvas.width = window.innerWidth;

canvas.height = window.innerHeight;

const bodies = [];

const stars = [];

const G = 0.05; // Gravitational constant

const collisionTime = 10 * 1000;

const newBodyDelay = 10 * 1000;

const now = () => performance.now();

function rand(min, max) {

return Math.random() * (max - min) + min;

}

function createStars(count = 300) {

for (let i = 0; i < count; i++) {

stars.push({

x: rand(0, canvas.width),

y: rand(0, canvas.height),

radius: Math.random() * 1.5,

alpha: Math.random()

});

}

function drawStars() {

for (const star of stars) {

ctx.fillStyle = `rgba(255,255,255,${star.alpha})`;

ctx.beginPath();

ctx.arc(star.x, star.y, star.radius, 0, Math.PI * 2);

ctx.fill();

}

class Body {

constructor(x, y, vx, vy, radius, color) {

this.x = x;

this.y = y;

this.vx = vx;

this.vy = vy;

this.radius = radius;

this.color = color;

this.mass = radius * 2;

this.alive = true;

this.spawnTime = now();

}

applyGravity(others) {

for (const other of others) {

if (this === other || !other.alive) continue;

const dx = other.x - this.x;

const dy = other.y - this.y;

const distSq = dx * dx + dy * dy;

const dist = Math.sqrt(distSq);

if (dist < 2) continue;

const force = G * this.mass * other.mass / distSq;

const ax = force * dx / dist;

const ay = force * dy / dist;

this.vx += ax / this.mass;

this.vy += ay / this.mass;

}

move() {

this.x += this.vx;

this.y += this.vy;

}

draw() {

ctx.fillStyle = this.color;

ctx.beginPath();

ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2);

ctx.fill();

}

collidesWith(other) {

const dx = other.x - this.x;

const dy = other.y - this.y;

return Math.hypot(dx, dy) < this.radius + other.radius;

}

function spawnInitialBodies(count = 8) {

for (let i = 0; i < count; i++) {

bodies.push(new Body(

rand(100, canvas.width - 100),

rand(100, canvas.height - 100),

rand(-1, 1),

rand(10, 20),

`hsl(${rand(0, 360)}, 100%, 70%)`

));

}

function handleCollisions() {

for (let i = 0; i < bodies.length; i++) {

for (let j = i + 1; j < bodies.length; j++) {

const a = bodies[i], b = bodies[j];

if (a.alive && b.alive && now() - a.spawnTime > collisionTime && a.collidesWith(b)) {

a.alive = false;

b.alive = false;

const newX = (a.x + b.x) / 2;

const newY = (a.y + b.y) / 2;

setTimeout(() => {

bodies.push(new Body(

newX,

newY,

rand(-0.5, 0.5),

Math.min(a.radius + b.radius, 40),

`hsl(${rand(0, 360)}, 100%, 80%)`

));

}, newBodyDelay);

}

function animate() {

ctx.clearRect(0, 0, canvas.width, canvas.height);

drawStars();

handleCollisions();

for (const body of bodies) {

if (!body.alive) continue;

body.applyGravity(bodies);

body.move();

body.draw();

}

requestAnimationFrame(animate);

}

createStars();

spawnInitialBodies();

animate();

</script>

</body>

</html>

CSS