The concept of Planet X, or Planet Nine, has captivated astronomers for decades. This hypothetical planet, theorized to be ...

A powerful new tool comes online this year that could help astronomers locate the mysterious planet hiding somewhere beyond ...

There are eight official planets (sorry, Pluto) in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. But astronomers have spent the better part of a century wondering ...

Planets with suns like Wolf 359 are subject to huge blasts of radiation that raise questions about their long-term ...

Images captured by NASA's Solar Dynamics Observatory have revealed that "coronal loops" give off subtle flashes of ...

Flickering coronal "loops" on the Sun are warning signs of a coming solar eruption, paving the way for better space weather ...

The James Webb Space Telescope has revolutionized astronomy in just three years. A new project celebrates its impact on the ...

Astronomers discover a network of cosmic tunnels linking our solar system to distant galaxies, revealing a dynamic and ...

Mars's atmosphere and climate are impacted by interactions with solar wind, a stream of plasma comprised of protons and ...

Astronomers believe that our solar system may still hold surprises, with ongoing efforts to find a hidden ninth planet, often referred to as Planet Nine or Planet X. If confirmed, this discovery ...

The eight major planets of our Solar System orbit the Sun in the same flat plane, and all at different speeds. Mercury, the closest planet to the ... of Chandra, its X-ray Observatory.