Or just a chunk of titanium. It's only made in novas and supernovas so having an abnormal trajectory, and speed only supports the theory. A bunch of titanium slapped onto some rock and then later breaks off or something.
>When compared to steel in a strength-to-weight ratio, titanium is far superior, as it is as strong as steel but 45% lighter. In fact, titanium has the highest strength-to-weight ratio of all known metals.
There's a reason cherry picked titanium. :)
Edit: "Based on the speed of the meteor and how much of the object burned upon entry, Loeb determined that it must be made of a material that is tougher than iron."
Yup.