What ARE Comets? Comet Ison aka C/2012 S1

Electric Universe / Concentric Circles In A Comet?!?!? / Luminaries / Frequencies/ Level Earth / I Thought Comets Were...per wikipedia.

"A comet is an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called outgassing. This produces a visible atmosphere or coma, and sometimes also a tail. These phenomena are due to the effects of solar radiation and the solar wind acting upon the nucleus of the comet. Comet nuclei range from a few hundred meters to tens of kilometers across and are composed of loose collections of ice, dust, and small rocky particles. The coma may be up to 15 times Earth's diameter, while the tail may stretch one astronomical unit. If sufficiently bright, a comet may be seen from Earth without the aid of a telescope and may subtend an arc of 30° (60 Moons) across the sky. Comets have been observed and recorded since ancient times by many cultures." - per Wikipedia

The Comet Has To Have Had a Trajectory Directly In Line With The Earth Because The "Comet" Doesn't Show A Tail From This Angle. That's What Makes Comets So Distinguishable, The Tail. Even If It Was On A 100% Path Straight To Hit Earth, You Would Logically Think At Least A Small Particle, If Only For A Second Would Be Able To Be Spotted Behind The Comet, But You Don''t!! That Means "Comet" Ison's "Propulsion System" Or Tail Was The Heated Area In The Dead Center Of The "Comet." So Are "Comets" Ice Chunks That Slowly Break Up Over Time Or Randomly Crash Into Other Luminaries After Thousands(verified) or even. Millions Of Years(speculated) Of Orbiting? Or Are They Something Only A Sci- Fi Writer Can Make Up Beyond Our Knowing?