Look low in the west-northwest after sunset in late May, and you can watch Venus, Jupiter, and Mercury pirouetting through the tightest gathering of three naked-eye planets that the world will see ...

If you look closely at the eastern horizon just before sunrise for the next two weeks, you should notice the bright planets Venus and Jupiter. Look closer still, perhaps with the help of binoculars, ...

It's prom season -- for the planets. Every couple of years, give or take, planets get together in the night sky in such a way that they seem to be aligned with each other. They seem to be, really -- ...

Recent simulations and research have unveiled a fascinating new insight into the history of the solar system’s terrestrial planets. For years, scientists speculated about how the rocky planets—Earth, ...

The four planets of the Kepler-223 star system seem to have little in common with the planets of Earth’s own solar system. And yet a new study shows that the Kepler-223 system is trapped in an orbital ...