It takes up to 1000 years for a stalactite to grow 1/2 inch.

What is the difference between a planet and a star ?

Stars are huge balls of hot gas that emit their own light . Stars burn hydrogen in their cores and have nuclear fusion going on inside. A planet does not have nuclear fusion. A planet is a world like the Earth. Unlike stars, planets get their light from the Sun.

Did you know?

Proxima Centauri is the nearest star to us and is 4.2 light years away.

A person who looks directly at the sun with binoculars or a telescope can be blinded for life.