Dark energy, the mysterious phenomenon that powers the expansion of the universe, may undergo periodic 'violent transitions' ...

Scientists using the James Webb and Hubble space telescopes have confirmed one of the biggest head-scratchers in modern ...

In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small and in the Milky Way, while Curtis took a more radical position that they ...

A newly identified Kuiper Belt trio, possibly only the second of its kind, could provide strong evidence that these distant ...

There are two ways to calculate the Hubble tension; let's call these "observation" and "theory" (though that's really oversimplified). Starting with the theory method, scientists make observations ...

Hubble’s original estimate was 500 km/s/Mpc ... Yet another mysterious character that could account for the discrepancy is “dark radiation.” This theory proposes the existence of a new class of ...

Even Einstein was reluctant to endorse this extension of his theory of general relativity. In 1929 at the Mt. Wilson Observatory in California, Edwin Hubble discovered that galaxies were moving ...

It's a new type of three-body problem for astronomers, who used the Hubble Space Telescope to determine that twin asteroids ...

Dark matter, dark energy, the Hubble tension: underpinning these theories is Einstein’s general theory of relativity, which treats space and time as a unified “spacetime” and considers ...

The puzzle of predicting how three gravitationally bound bodies move in space has challenged mathematicians for centuries, and has most recently been popularized in the novel and television show '3 ...

The eight ripples seen by the Hubble Space Telescope in this cosmic scene marks the ... which suggest the rings expand outward from the point of collision. "That theory was developed for the day that ...