NASA has reached a significant technological milestone with progress on an experimental form of spacecraft propulsion which utilizes solar radiation. The space agency successfully deployed one of four ...

About a year from now, if all goes well, a box about the size of a loaf of bread will pop out of a rocket some 500 miles above Earth. There in the vacuum it will unfurl four triangular sails.

Susanna Post, the 2021 Arkansas Teacher of the Year, is getting ready for a model sailboat race. Her sailboat has triangular-shaped sails. Can you help her name and classify triangles? Rise and Shine ...