[kjs3]

I stand corrected. I definitely missed the "floating alone in space" part...for some reason I got in my head there was a companion.

[danparsonson]

They did discuss that possibility, at least in the paper, and it was my first thought for an explanation, but I think they discounted it because it would require an unrealistic or impossible orbit.

[kjs3]

I jumped to a similar conclusion. Not my best post.

[danparsonson]

Happens to the best of us :-)

https://xkcd.com/1053/