In 1925, Edwin Hubble's observation of Cepheid variables in the Andromeda galaxy revolutionized astronomy, proving the ...

The study of symmetries in black hole spacetimes has emerged as a cornerstone for comprehending the underlying dynamics of these enigmatic compact objects. By identifying both explicit and hidden ...

You say in your article that modern, scientific cosmology didn’t get started until roughly the 1920s. What happened then? It’s not as though nothing happened earlier. People have been speculating ...

Astronomers have successfully charted a colossal cluster of galaxies, extending billions of light years. This unprecedented exploration into cosmic structures could provide new insights into the ...

Some astronomers think one set of measurements or the other will turn out to be wrong. Others believe that the tension is a hint of deeper problems with the scientific description of the universe, ...

Two colliding galaxies have been found to be reorganizing their dwarf satellites, potentially solving a major conundrum plaguing the standard model of cosmology.

But most of what was done before about 100 years ago we would now call galactic astronomy, which is the study of stars, planets and interstellar gas clouds within our own Milky Way. At the time, in ...