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

Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's responsible for the orbits of the planets and their satellites, but there ...

For others, many comets and asteroids ... "In about 1604, Johannes Kepler fitted an ellipse model of Mars' orbit to observations of Mars," Bloomer told Space.com. "He came up with the first ...

Until the likes of Copernicus, Kepler and Galileo came along ... Dhara explains that comets are relatively small “objects that orbit around our sun, and they have very long orbits which means ...

To find a planet on an orbit similar to our own, Kepler would have to monitor the star for several years to confirm that the dips repeated. Scaled up, that meant that Kepler needed to watch one ...