The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Staring at the sun—a close (but safe) look at our home star ... a new idea to keep kids entertained? Try stargazing. Free learning activities and videos about the solar system Free learning ...

Six of the planets in our solar system will line up, in what is sometimes called a 'planetary parade'. They include Venus, ...