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 ...

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

Dust off your old telescope on a clear night and look up. If you find Jupiter, you’ll likely see four small dots to the side ...

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

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

While we perceive the Sun as yellow, its actual colour is white. This is because our atmosphere scatters the shorter, blue ...

When a mudflat crumbles on Earth, or an ice sheet splinters on one of Jupiter's moons (Europa), or an ancient lakebed breaks ...

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

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

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