Meteors, meteorites, meteoroids, etc.

Meteors, meteorites, and meteoroids are kind of interconnected.

Meteoroids is a small rocky or metallic object that is travelling through the space. Meteor is the streak of light that follows it (like the tail or the shooting star), it happens when the meteoroid burns in earth's atmosphere. And when it finally hits the earth, it is termed as meteorite.

Comets are heavenly bodies made of ice, dust and rock. these orbit the sun just like our earth. They are believed to be the remains from the formation of our solar system.

these are huge and when in their frozen state, they could be about the size of your city.

When they come closer to the sun, they heat up and release heat and gases, forming a tail called coma.

Asteroids are kind of the same thing, but they are more rocky in composition compared to comets, which are more icy. Asteroids are also remnants from the formation of the solar system. 

However, these guys lack a tail!