Why there is no smoke around the Sun?
Where there is fire, there is always smoke. So why there isn't any smoke near the Sun?
Why the downvote? Thinking that the Sun is on fire is quite common. We even use the term "stars burn their fuel" and similar terms. Googling the answer is not straightforward if you have no idea where to start. +1 from me.
Also, the saying is "Where there's smoke, there's fire". So the existence of smoke would imply the existence of a fire, but not vice-versa.
If you really want to play loose with terminology, the sun "burns" with nuclear fusion and produces "smoke" in the form of plasma. This is very simplified, grossly inaccurate, but it gives an easy to describe visualization of the process.
People here do need to be too serious. Where there is fire, there is always smoke. yeah!
_"Where there is fire, there is always smoke."_ - No there isn't, clean-burning gas doesn't produce smoke. See any decent gas stove. :)
The sun isn't on fire. Fire is actually very rare in the solar system. It requires chemical potential energy, which happens on earth because of life. Photosynthesis uses solar energy to build things out of carbon, oxygen, nitrogen and hydrogen (and some other elements). It's these carbon chain structures that are ultimately flammable, and pretty much, only in an Oxygen atmosphere. Oxygen atmosphere is produced by the same photosynthesis.
The sun's heat comes from nuclear fusion which doesn't make smoke. Also, the nuclear fusion only happens deep the inside of the sun, the outside is just a thick blanket of molecules - mostly hydrogen. The sun also isn't transparent. The light we see from the sun is like the light we see from a red hot piece of metal or lava. Red hot metal doesn't smoke (unless you drop water on it - which is actually steam.) The sun, like red hot metal or lava, glows bright because of temperature.
In a certain sense, the tail of a comet is kind of like steam being made by the heat of the sun.