An Egyptian astronomer called Ptolemy (AD100-168) described one of the earliest ideas for how the Solar System is structured. Ptolemy’s model and many earlier ideas of the Solar System had the ...

Need a new idea to keep kids entertained? Try stargazing. Free learning activities and videos about the solar system Free learning activities and videos about the solar system Free learning ...

The exact shape of the Oort cloud and how it is affected by forces beyond our solar system have, so far, remained mysterious. Now, researchers have developed a new model that suggests the inner ...