Quasars represent some of the most luminous and energetic phenomena in the universe. These distant powerhouses are driven by ...

A team of astronomers believes they may have spotted a serious candidate for a ninth planet in our Solar System. This object, ...

From solar probes to deep space missions, these record-breaking human-made objects reached speeds that make bullets and jets ...

A ninth planet the size of Neptune may be hidden in the far reaches of the solar system, but the evidence has left some experts skeptical.

Researchers say they found a curious dot on infrared images taken 23 years apart that seems to be moving in a manner ...

An alternate explanation that fits the evidence is that Vesta was once part of a planet – but which planet that might been ...

Astronomers have long speculated about an unseen planet lurking in the solar system's outer edge. This hypothetical world, ...

For years, astronomers have toyed with the idea that the Sun hides an extra planet so distant and dim that even the best ...

Juno sheds light on Jupiter’s polar storms and Io’s hidden lava, offering insights at two of the solar system’s most extreme ...

Vesta might be a shattered remnant of an early planet, not a failed one—forcing scientists to rethink how worlds begin.

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

Bacon (STScI); Science: NASA, ESA, and C. Fuentes (Harvard-Smithsonian Center for Astrophysics) In a distant corner of our ...