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Astronomy

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]

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