The natural phenomenon characterized by a bright light in the sky is called an aurora. Auroras are stunning displays of light that typically occur in polar regions and are caused by the interaction between charged particles from the sun and the Earth's magnetic field. These particles collide with gases in the Earth's atmosphere, resulting in colorful lights, often appearing as green, red, yellow, and blue hues. The two main types of auroras are called aurora borealis (Northern Lights) in the northern hemisphere and aurora australis (Southern Lights) in the southern hemisphere. They are truly mesmerizing natural spectacles.