The planet is 100 times the size of earth, astronomers estimate. The James Webb telescope has made another stunning discovery -- this time of a massive planet that could potentially sustain life ...

The outlook isn’t great for the exoplanet HIP 67522 b. Over the next 100 million years, powerful magnetic fields and destructive cosmic radiation will continue eating away at the distant planet ...

If Planet 9 is real, this observatory has around a 70 to 80 percent chance of finding it, he estimates, adding that it's not a sure thing because there are so many uncertainties.

New Horizons spacecraft survives trip 1 billion miles beyond Pluto 02:03. It's an evocative idea that has long bedeviled scientists: a huge and mysterious planet is lurking in the darkness at the ...

As astronomers study an exoplanet called K2-18b, conflicting research reveals how difficult it is to find evidence of life beyond Earth.

The hunt for Planet Nine—the solar system’s ghostly gravitational troll—is longstanding, and is based on the peculiar clustering of rocky bodies in the Kuiper Belt beyond the orbit of Neptune.

Scientists find "strongest evidence yet" of life in space 01:04. Astronomers announced Thursday that they had detected the most promising "hints" of potential life on a planet beyond our solar ...

Earth has a newly-discovered neighbor in the solar system.. But the heavenly body – possibly a dwarf planet à la Pluto – isn't a frequent visitor. Located beyond Neptune, its extreme orbit ...