Will a candle burn in zero gravity?

Under normal conditions, the fire will not burn. Since oxygen is burned, that is in the air. And in zero gravity itself there is no oxygen. A spaceship is another matter. Under gravity, fire forms small balls. At the same time, there is a flame, but rather weak. But one way or another, it is still a fire, and on contact with oxygen or fuel, a large flame can burst out. In space, fire burns at a lower temperature than on Earth.