When it comes to celestial bodies, the sun is undoubtedly one of them. But not only that, it's probably the hottest one. When you see the sun there's no arguing that it's bright and it's also most likely daytime. Is the sun too hot though? Is it too big and yellow and bright? There's a lot going on with the sun and it's about time people like us got to the bottom of what makes that big, fat, orange ball of hot tick.