TRI-CITIES, Wash., - A new educational project is set to transform the trails along the Columbia River into a scale model of ...

TIMHi, I'm Tim Peake. I'm an astronaut based here at the European Space Agency in Germany, and from December 2015, to June 2016, I spent six months orbiting Earth on the International Space Station.

Narrator: Serious scientists, like myself, believe our solar system was formed by the collapse ... This theory was known as the heliocentric model. It was controversial as accepted wisdom at ...