A Cepheid variable or a nova depending on what you are trying to observe.
Probably type la supernova
A trick candle has a trick wick of the trickiest kind.
It depends on what kind of wax that the candle is made out of
hard stuffs
A burning candle produces thermal energy and light.
Electromagnetic
it would be
Aluminium
A candle is a heterogeneous mixture of paraffin wax and other additives like colorants and scents. The wax solidifies as the candle cools, trapping the additives in the solid matrix to create the candle.
It takes the energy of heat.
soap and candle
Green residue on the wick could indicate that the candle contains impurities or additives that are burning off. It could also be a sign of the candle burning unevenly, which may be caused by the wick being too long or the candle being exposed to drafts. It's best to trim the wick and avoid burning the candle in a drafty area to prevent this issue.