Discover the order of planets in the solar system. From Mercury to Neptune, explore our solar system and learn more about our cosmic home. The solar system is our cosmic neighborhood, made up of ...

Curious Kids is a series for children of all ages ... A cloud of collapsing gas created our Sun, the first thing to form in our solar system. This happened about 41⁄2 billion years ago . Then the ...

Are planets in the solar system that are closer to the Sun older than the ones further away? – Gavriel, age 10, Paducah, Kentucky A cloud of collapsing gas created our Sun, the first thing to ...