[Zuben Elgenubi]

I’m betting it’s made up primarily of rock and ice. lol

[SunkenCiv]

:’)

[Talisker]

I’m betting it’s made up primarily of rock and ice. lol

You can laugh when you've found some ice.

[Swordmaker]

I’m betting it’s made up primarily of rock and ice. lol

I'm betting that like every other comet we've visited or flown by, there will be NO ICE, just rock.

[SunkenCiv]

http://en.wikipedia.org/wiki/Giotto_(spacecraft)

Measured volume of material ejected by Halley:
80% water,
10% carbon monoxide
2.5% A mix of methane and ammonia.
Other hydrocarbons, iron, and sodium were detected in trace amounts.