Despite decades of searching for dark matter, we’ve come up empty handed. So, what is the alternative?
Galaxies live inside dark matter halo “houses”—but there seems to be a lot of empty homes out there.
Some galaxies are extremely massive, compact and filled with dust—how they became so extreme remains a mystery.
Before we had high-resolution observations of the Sun, explanations for sunspots ranged from the ridiculous to the sublime.
Computing celestial alignments may be routine today, but for medieval astronomers it was a major undertaking.
Lunar eclipses can help us understand meteoroid impacts and exoplanet atmospheres.
What’s careening through the galaxy at 2.5 million miles per hour and screaming with gamma-rays?
There are some strange similarities between ultra-faint dwarf galaxies and globular clusters—with dark matter anchoring both.
How the event helped a 14th Century astronomer reconnect with Ptolemy’s era.
After decades of wondering, the Event Horizon Telescope has revealed what a black hole really looks like. [Feature excerpt]