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 ...

In the 1920s, astronomers thought that the Milky Way was the entire universe. Hubble's discovery revealed a much bigger ...

It is a spiral galaxy like our own, the Milky Way. Zhúlóng also shows a clear division between its central concentration of stars, known as the bulge, and the disk where the spiral arms are located.

On a clear night with dark skies, you can catch a glimpse of the Milky Way, a luminous arc stretching ... By far the most ...

Also called M31—and our closest giant neighboring galaxy at just 2.5 million light years away—Andromeda is home to at least a trillion stars. Like the Milky Way, it’s a spiral galaxy ...

A century ago, Edwin Hubble first established that this so-called 'spiral nebula' was actually very far outside our own Milky Way galaxy -- at a distance of approximately 2.5 million light-years ...

Somewhere in between, humans realized the universe is much larger than our Milky Way — that the spiral nebulas visible ... universe beyond the Milky Way galaxy, but his work really stood on ...

The Milky Way is our home galaxy home to 100-400 billion stars (no one is quite sure how many). It’s a spiral galaxy estimated to be about 13.6 billion years old. It's 100,000 light-years across.

if we were able to get above the Milky Way, it would look like an enormous spiral about 100,000 light years across. The centre of the galaxy is a dense and chaotic place, with stars and gas hurtli ...

A century ago, Edwin Hubble first established that this so-called "spiral nebula" was actually very far outside our own Milky Way galaxy —at a distance of approximately 2.5 million light-years ...

An artist's impression of the Milky Way, seen edge-on. Image: ESA/Gaia/DPAC, Stefan Payne-Wardenaar The European Space Agency’s Gaia mission has completed one of its major charges: delivering a ...

Observations show Andromeda has a more active star formation history than the Milky Way, potentially due to a past galactic collision. NASA recently released images of the Andromeda galaxy ...