Meteors are streaks of light that appear in the sky when a dust particle from space evaporates high in the Earth's atmosphere. The light phenomenon in the atmosphere is called a meteor, while the dust particle is called a meteoroid. The estimated diameter of its nucleus is 3.6 kilometers. The radiant of the Leonids is in the constellation Leo. The radiant is a perspective effect.
All particles move in about the same orbit.
An observer in the middle of the stream sees the meteors fall left and right, above and behind him, however they all seem to radiate from a certain point in the sky. That point is called the radiant. Meteor streams occur when Earth passes through a trail of ice and dust thrown off by a comet. Meteor outbursts are meteor streams with levels of activity significantly above normal. Leonid meteor streams occur every year.