“Observing the Galaxy is like standing in the middle of a brightly lit city at night. If you look toward the outskirts, the ...

The filament of matter stretches 50 million light-years, and contains a row of galaxies 5.5 million light-years long that are ...

In the leading model of cosmology, most of the universe is invisible: a combined 95% is made of dark matter and dark energy.

But the Big Bang theory predicts that about 5% of the universe’s contents should be atoms made of protons, neutrons and electrons. Most of those atoms cannot be found in stars and galaxies – a ...

If you look across space with a telescope, you'll see countless galaxies, most of which host large central black holes, ...