in that it is green, travelling backwards and has two tails and that it is visible to all of us.
The green I looked up,
A frequently-asked question: Why do some comet atmospheres glow green?
Answer: The coma contains cyanogen (CN), a poisonous gas, and diatomic carbon (C2). Both of these substances glow green when illuminated by sunlight. This is called “resonant fluorescence.”
and the two tails too,
One tail is the ion tail. It’s made of electrically charged atoms and molecules (ions) blown away from the coma by the solar wind. This tail points straight away from the sun. Gusts of solar wind can cause the ion tail to swing back and forth, to develop curlicues and temporary knots. Amateur astronomers have seen this happen in recent weeks.
The other tail is the dust tail. Comet dust is weightier than gas. It resists solar wind pressure and lingers behind the comet, tracing its orbit. Solar wind gusts have little effect on the dust tail.