Test your knowledge on our solar system, from the biggest and smallest planets to the behemoth mountain on Mars.

Encountering Neptune in 1989, NASA’s Voyager mission completed humankind’s first close-up exploration of the four giant outer ...

Encountering Neptune in 1989, NASA's Voyager mission completed humankind's first close-up exploration of the four giant outer ...

Widespread magnetism dating from our solar system’s earliest beginnings some 4.57 billion years ago likely played a major role in creating orbital order out of chaos. But until now, magnetism ...

For billions of years, it's kept our ... solar system. The solar system is approximately 4.6 billion years old. Astronomers believe that roughly 100 million years into its existence, the planets ...

Jupiter, the largest planet in the solar system, will be visible to sky gazers on Earth. Here’s when to look out for it and ...

If astrobiologists are ever going to detect life beyond our solar system, it will arguably be done via spectroscopy of an earth-like planet's atmosphere as it passes in front of its parent star.