As they leave the solar system, the Pioneer spacecraft have anomalously decelerated, pointing to a possible gap in our understanding of gravity. Now, a computer graphics technique known as Phong shading predicts that the Pioneer anomaly is just a side effect of how the shape of the spacecraft reflects sunlight.
Jerry Woodfill was an engineer with a mission control console at NASA when Apollo 13 became critically endangered by a blown oxygen tank. He shared his views on how the crew survived with Universe Today in a series of posts: 13 Things that Saved Apollo 13 written by Nancy Atkinson. [more inside]