For decades, our solar system was thought to have nine planets, with Pluto considered the smallest and farthest. But in 2006, ...

For comparison, Pluto is only about 40 AU ... yet there isn't one in our solar system. "Planet Nine is going to be the closest thing we will find to a window into the properties of a typical ...

The International Astronomical Union’s Minor Planet Center, which catalogs new moons and other small bodies in the solar ...

For comparison, the full moon is about 30 arcminutes ... Yet none of this kind exist in our solar system. Planet Nine would help fill that gap.' Specifically, finding a large planet at the rim ...

in comparison to the orbits of Mercury, Venus, Earth, and Mars. Most of these extrasolar planets are much closer to their host stars than the innermost planets of our solar system are to the sun.

Star TOI-6894 is just like many in our galaxy, a small red dwarf, and only ~20% of the mass of our sun. Like many small stars ...

The presence of water-ice in the debris disk around a young star could have helped facilitate the growth and development of ...

“In each simulation, you try different parameters for the extra planet. A different mass, a different tilt, a different shape of the orbit. You run these for millions of years, and then you compare ...