This discovery marks the first known case of a compact planetary system with such a noticeable tilt between close planet ...

Astronomers have spotted an alien planet orbiting so closely to its home star, the planet's magnetic field is triggering ...

Stars often whip their planets with solar winds and radiation, pull them ever closer with gravity and sear them with heat.

Astronomers using the European Space Agency's Cheops mission have caught an exoplanet that seems to be triggering flares of ...

But an international team of astronomers have detected the unmistakable signature of a gas giant planet orbiting the ...

Artist's impression of Planet Nine – a suspected “wide-orbit” planet – with the Sun in the distance; Neptune's orbit is shown ...

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.