Pluto will mark a birthday of sorts on March 23, 2178. No one is likely to be there to celebrate it, of course. Even if ...

The giant-impact hypothesis posits that billions of years ago a Mars-sized body named Theia collided with the early Earth.

By looking ever further back in time, the James Webb Space Telescope is at last revealing the first galaxies – and a very ...

New research suggests that dark energy isn't needed to explain the acceleration in the expansion of the universe — instead ...

The space telescope Gaia has created the largest three-dimensional map of the Milky Way ever. On January 15, 2025, Gaia shut ...

Atomic clocks are more accurate than those used to define the second, suggesting the definition might need to change ...