So exactly how many solar system moons have we found? The answer, it turns out, depends on your definition of a moon. The International Astronomical Union (IAU) officially recognizes 288 planetary ...

The Solar System is a vast and varied landscape offering an array of planetary and moonscape phenomena unlike anything found ...

The seven other planets in our solar system will line up in the night sky on Friday evening for a rare alignment called a ...

Most of the planets are aligned in our night sky right now, providing a treat for skywatchers. Are such "planetary parades" ...

With a sun more than 4.5 billion years old, our solar system is considered "middle-aged," and the pictures of what it might ...

Once its rings vanish from sight in March 2025, Saturn will look like a pale yellow sphere through most telescopes.

Another finding was how dramatically the planets varied in brightness over just three years. The team discovered that PDS 70 ...

Mercury has a rocky surface when, facing the sun, can reach highs of 800 degrees while overnight lows could reach minus 290 degrees, according to the space agency. Venus holds the crown of the hottest ...

The discovery that helium and iron can mix at the temperatures and pressures found at the center of Earth could settle a long ...

If there was a contest for the most interesting moon in our solar system, Callisto would be a contender. Jupiter's ...

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