NASA Voyager 1 probe discovers Saturn’s moon, Epimetheus. Saturn would be the last planet Voyager 1 would visit before ...

NASA’s Voyager mission completed humankind’s first close-up exploration of the four giant outer planets of our solar system.

The seven planets will not be perfectly aligned, but will appear in an arc across the sky due to their orbital plane in the Solar System.

In a celestial event known as a great alignment the five planets will be discernible with the naked eye, but to see Neptune ...