What does AD, BC, BCE, and CE means?

We usually hear, or read these words on history books, and Bibles. But what do they really mean?

Mercury—The Smallest Planet in the Solar System

Named after the Roman God Mercury, son of Maia and Jupiter, the messenger of the gods and the god of travelers, is a planet 35,980,000 miles (57,900,000 km) away from the sun. It is the smallest and the hottest planet in our Solar System with the equatorial diameter of 3,030 miles (4,878 km) and surface temperatures of -300°F (-183°C) to 800°F (427°C).

A Planet With Three Suns

Have you watched Star Wars? No? Me too. On the movie Star Wars, Luke and Anakin Skywalker's home planet, Tatooine, have two suns.