Unusual shape of Fomalhaut's debris ring shows evidence of sculpting by ancient planets, rewriting story of planetary system ...

Scientists now hope that future ALMA observations will provide even more evidence—and perhaps direct hints—of the mysterious ...

Five personalities, including Iris Van Herpen and Tommy Dorfman, talk about what makes them unique, and why that makes them successful.

Our planet whirls around the sun in an ellipse, rather than a circle. On Thursday the planet reached its farthest point from its star, known as aphelion.

Orbital eccentricity is measured in values from 0 to 1, with 0 representing a perfect circle and 1 representing a parabola. Any value between this is an ellipse.