[Yosemitest]

I don[t remember her saying Ison would hit our World, so much as she suggested

there's a strong possibility that the debris trail (a cone shape) would affect us.

She also suggested that Ison might come around the Sun not in one piece, but shattered by the Sun's gravity, and highly radiated.
She also suggested that the outbound path (from the Sun) of Comet Ison might bring the debris tail into the Earth's path BEFORE we reach the debris trail left from Ison's inbound path.
So there's TWO chances we have for a prolonged attack on our World's surface from "Falling Stars".
And if Ison is shattered like the comet that struck Jupiter, then what?

But Ison just might crash into the Sun, and if there's a large amount of IRON inside Comet Ison, then how would that affect the Sun's solar activity?
Anyone who watches the Science channel knows that IRON is a killer of stars.

[Mike Darancette]

there's a strong possibility that the debris trail (a cone shape) would affect us.

But she shows the debris field leading the comet. The Comet's tail is not the debris field.

[coon2000]

99% of the mass of our solar system is the Sun. A comet would be like a speck of dust landing on your body.

[Windflier]

Ison just might crash into the Sun, and if there's a large amount of IRON inside Comet Ison, then how would that affect the Sun's solar activity?

The sun is a million miles across. Something as small as Comet Ison doesn't contain enough iron to set off the sort of chain reaction that would kill our star.

The sun has probably devoured trillions of such morsels during its lifetime with hardly a burp.