A powerful new observatory is the best hope yet for finding the elusive Planet 9, a large planet that some scientists say is ...

Dubbed "Planet Nine," this hypothetical celestial body is believed to influence the orbits of distant, small objects beyond ...

During April its distance from Earth increases by 25.4 million miles (40.9 million km), equal ... great photo of any of the planets and would like to share it with Space.com's readers, send ...

Mar. 17, 2025 — The James Webb Space Telescope has captured its first direct images of carbon dioxide in a planet outside the solar system in HR 8799, a multiplanet system 130 light-years away ...

Our planet's closest and brightest neighbor will pass approximately between the Earth and sun this week, in what's called an ...