Nothing is inevitable, as Portuguese voters demonstrated last weekend when crushing a hard-right Trumpophile challenge. Maybe ...

Gas giants are large planets mostly composed of helium and/or hydrogen. Although these planets have dense cores, they don't ...

Relatedly, astronomers may have just pushed the upper size limit of what counts as a planet.

A dazzling new Hubble image peels back the layers of the mysterious Egg Nebula, a rare and fleeting phase in a Sun-like star’s death just 1,000 light-years away. Hidden inside a dense cocoon of dust, ...

Since the 1990s, astronomers have found a handful of other dwarf planets in the belt, such as Eris and Sedna, along with ...

Recent observations suggest that 'runaway' black holes are tumbling through the cosmos. Building on decades of theory, the discovery adds a remarkable new chapter to the story of the universe.

The Sun would be a far more powerful telescope than any humanity could create in the near future. But to use it, we need to get to 650 AU.

Their observations of a faint, cool M-dwarf star called LHS 1903 revealed a system with a rocky world at its outer edge. LHS ...

NASA’s Nancy Grace Roman Space Telescope will conduct a wide-area survey to study dark matter, dark energy, and the expansion of the universe across 11 billion light-years.

Hubble observations reveal a giant, turbulent planet-forming disk that may reshape theories of how planetary systems develop.

In an ambitious new proposal, scientists suggest that humanity could soon turn the Sun into a colossal telescope, allowing us to observe distant cosmic objects in ways never before possible. By ...