How can fission-powered propulsion help advance deep space exploration, specifically to the outer planets like Jupiter, ...

After detecting the unusually bright signal, astronomers checked observations from another telescope, and found an unexpected ...

OF201 is incredibly lightweight on a cosmic scale. Scientists estimate its mass is about 20,000 times less than Earth’s and ...

A recently discovered celestial body is rewriting our knowledge of the Kuiper Belt and maybe challenging the existence of the ...

A passing star has been discovered that could cause chaos in the Solar System, sending Earth flying out of orbit.

Scientists have identified an object about 435 miles (700 km) wide inhabiting the frigid outer reaches of our solar system that might qualify as a ...

The TNO, which are described as minor planets that orbit the sun at a greater distance than Neptune, were found on the edge ...

Scientists have recently spotted a huge object far away in the cold outer reaches of our solar system. This ...

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach ...

As it orbits the sun once every 25,000 years, the celestial body 2017 OF201 travels beyond the Kuiper Belt into a region ...

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system.