For science-fiction enthusiasts, that’s a bit depressing. Space is big, and while the speed of light is incredibly fast to us ...

What is the biggest object in the universe? Learn more about the biggest objects in the universe, including galaxies, galaxy ...

According to the equations that govern black holes, the larger one of these cosmic behemoths is the lower its average density ...

On the night of Oct. 5, 1923, Edwin Hubble observed a strange star that flickered in intensity at regular intervals. The star ...

If ultimately true, the universe will reach its maximum size around 11 billion years from now. At that point, physics (and ...

The universe is approaching the midpoint of its 33-billion-year lifespan, a Cornell physicist calculates with new data from ...

This article, originally titled "The Man Who Discovered the Universe," is from the Summer 2025 issue of Air & Space Quarterly ...

The first stars in the universe formed out of pristine hydrogen and helium clouds, in the first few hundred million years ...

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

We’ve grown up with the idea that the universe will expand forever, meaning the "cosmological constant" is positive. What if ...

Astronomers have traced the hidden fingerprints of dark matter by observing rare, glowing galaxies that lived in the early ...

Astronomy is, in essence, an exercise in inference. We cannot touch the stars, nor scoop up galaxies in a lab. Instead, we ...