The 11 objects discovered could be a new class of objects orbiting in a “ring” in the distant reaches of the solar system.

A passing star may have kicked the weird moons of giant planets like Jupiter and Saturn into place, new research suggests.

IT is easy to feel like we know nothing about our universe, and unexplained stellar objects are the most puzzling feature of ...

All these thoughts of photographs of the planets and whatnot take me back to my childhood, when I pored through books ...

The question of just how dark the universe is has vexed astronomers for decades, because from our stretch of the solar system ...

Now, scientists have measured the true darkness of the Universe, by taking the most precise measurements yet of the faint ...

BepiColombo, a joint European-Japanese mission, completed its fourth close pass of the innermost planet last week, and it will enter Mercury’s orbit in 2026 to learn more about its mysteries ...

Experts have virtually explored the far reaches of the solar system to gather precise measurements of the glow that fills the ...

Whether you’re starting your journey at Mercury or have already achieved Pluto status with your closest friends, every ...

When the International Astronomical Union announced in 2006 that Pluto was being demoted from its status as the Sun's ninth ...

According to a new study, if a primordial black hole passed within a few hundred million miles of Mars, it could shift the planet's orbit by about a meter -- causing a "wobble." ...

Compared to Valles Marinensis, the Grand Canyon of Colorado is tiny, measuring 446 kilometers long, with a maximum width of ...