[@Ashifili][@Zombehs]

I'm just repeating what KoL said. I don't know all tbe sciency stuff like you guys do.

I am wondering how KoL worked it out as 550.5 KG per star and you guys only 10kg per star. I do know that the standard M107 155mm projectile has a weight of approx 43kg, but that's also got explosives in it.

However, the energy released by an impactor depends on diameter, density, velocity, and angle. That means not only do we have to think about weight and speed, but density and shape. If I want to break a car, I could either hit it with a sledgehammer or drive another car into it. Yet the sledgehammer would take less damage than the secomd car. Why? Because the sledgehammer, though lighter and smaller, is denser. You could have something really fast and really heavy, but the energy it releases and thus damage dealt might not compare to a lighter, slower, denser object.
It's also difficult to compare this projectile to explosives. I presume these "stars" use only blunt impact as a weapon, so comparing it to a tactical nuke is obviously going to skew things. Nukes blow up and add explosive damage to the initial impact. That said, comparing things by how much damage they do to the ground is also rather fruitless. Earth is tough - years of high-impact meteors have proved this. Comparing it to something that is less durable, like a car, or a building, would make more sense because they don't have that sheer resitance earth does. I drop an anvil on the ground and crash a plane into the ground - minimal damage. Drop an anvil on a building, it plows through a few floors. Drop a plane on building... well, we all saw 9/11.

When we start adding numbers into things, it just gets confusing. I usually just compare the damage to something else i.e. a 9mm bullet, a rocket launcher, a sparrow in a glittery dress.

And that's my two pence on the matter XP