Keep your eye on the ball” is a motto for many athletes—and for astronomers trying to find Earth-threatening space rocks ...

The golden planet is Mars. Visible below Jupiter and ... That's because all planets orbit the sun in a slight ellipse. As a consequence, some oppositions can see it closer to Earth and others ...

"In about 1604, Johannes Kepler fitted an ellipse model of Mars' orbit to observations ... according to the Royal Greenwich Observatory. Dwarf planet Pluto, on the other hand, has a fairly ...

Our planet's orbit around the sun is an ellipse. The sun is located at one of the focal points of this ellipse. According to Johann Kepler's law's of planetary motion, developed during the 1600s ...