Hoagland thinks Iapetus is artificial

[james_davis_nicoll]

Yeah, I know. I was surprised too.

There is no viable geological model to explain a sixty thousand-foot-high, sixty thousand-foot-wide, four million-foot-long “wall” … spanning an entire planetary hemisphere … let alone, located in the precise plane of its equator!

Well, except for this one.

Nicked from Bad Astronomy

Comments

[dd-b.livejournal.com]

Seems pretty clear to me: it's obviously a mold mark. Iapetus must be a cheap plastic toy; this explains the low density as well.

[debgeisler.livejournal.com]

We get close enough, we might see "Made in Betelgeuse."