A comet is made up of ice, dust, and gas, and forms a bright tail.
A meteor is a small rocky or metallic object that burns up upon entering Earths atmosphere.
The northern lights, or aurora borealis, are caused by solar particles colliding with Earths atmosphere.
Halleys Comet is visible from Earth approximately every 76 years.
Astronomers track celestial objects like asteroids and comets to monitor potential threats to Earth.