Sorry but I just watched the video you just posted and I have to...

That hurt a little...
Where do I start?
Lets do a science experiment...
Go out side and look at the sun...
No hold up your hand in front of your face...
OMFG its bigger than the sun!!!!
....No its not you idiots!! The comet is about the size of an aircraft carrier or two but its shooting out all sorts of stuff because the sun is basically boiling it and its passing closer to the SOHO's camera than the sun.
"The sun flare moved the comet"...
Ok its bigger than Jupiter and the solar flare move it... why didn't the solar flare knock us out of orbit... why didn't the solar flare microwave us?
"It should have pulled Mercury in to the sun."
... yes it should have... but it didn't... because its not twice the size of Jupiter.
Ok something of two Jovian masses that close to the sun would begin to pull in matter ejected off the sun and ignite for a little while.

Photoshop...

Want me to make you a giant planet zipping by Earth with it?

I would say that appears to be the radiation plume of a large fusion drive. Probably from a spacecraft gathering antimatter from the sun with a bussard collector...