As you abused a NASA derived technology to spout your idiocy here, I’d expect more respect.
But, as has been noted recently, the velocity of light is NOT QUITE a constant, hence we must derive the ORIGINAL AND CURRENT constant, idiocy. To THAT, you are above a standard candle!

Keith, that is a misconception. Actually, this was my mudder ship. As it wasn’t raining enough recently, it could not divert and land.
The udder two are only to deliver milk.

http://en.wikipedia.org/wiki/Iapetus_(moon)#Two-tone_coloration

&

http://www.space.com/4444-mystery-saturn-faced-moon-solved.html

& see also :

http://www.youtube.com/watch?v=51zB6TVYhPg

A youtube clip of the Cassini Iapetus fly-by on the 10th of September 2007. Hope that helps.

It had enough mass to become rounded and be in hydrostatic equilibrium. Or pretty clse to it anyhow just like Mimas and the other larger moons in our solar system – & presumably everywhere else.

I guess you were refering to why Iapetus, sometimes called the “yin-yang moon” is half dark and half light in colour instead?

If so, the explanation for the hemispherical colour disparity is that dark material from the outer moon Phoebe has collected on Iapetus’es drak side and a feedback process of sublimation basedon the contrasting albedo has then exacerbated this creating the two-tone effect.

(I’ll post a link or three for you but you probably won’t see them until tomorrow as they’ll have to pass through moderation.)

Dennis

@ 12. Uncle Al : “Is there anything within NASA’s charter that prohibits it from accomplishing something interesting?”

You don’t find landing people on the Moon, flying spaceplanes or sending spacecraft to explore every planet – & many moons, asteroids and comets – in our solar system interesting?

“Amateur” astronomers can sure make some cool videos!

@#1. It couldn’t be Rama, as that was spinning on its long axis and had almost zero difference in its light curve, and was like a thousand times larger.

Now excuse me while I science a bit: According to my calculations, and other sources, the rock is spinning roughly every four minutes. That would imply a centripetal acceleration of about 1/4000 g. It’s own surface gravity would be around a hundred times weaker than that, so it’s almost certainly a single solid body. Probably some boulder that was knocked off of another asteroid millions of years ago and has been drifting ever since.

At least 1218 asteroids cruise within spitting distance of Earth. NASA burns $billions on little vehicles making heroic publicity spews. Meanwhile, primordial bodies are knocking on Earth’s door saying “grab me.” Apophis might choose to break and enter.

Is there anything within NASA’s charter that prohibits it from accomplishing something interesting?

(If you don’t get it, consider yourself lucky)