The Moon passes just 0.4° south of Virgo the Maiden's bright alpha star, Spica, early on the morning of May 10.

Often bucking tradition, these women sought knowledge of the universe and reimagined the way we view the cosmos.

A remnant of the Soviet Venus program, Kosmos 482 has stayed aloft in in Earth's orbit for 53 years. But it may make a return ...

Abell 2256 is a rich cluster in Ursa Minor with more than 500 members and lies about 800 million light-years away.

A bright Moon dominates the sky, passing two bright stars as Juno reaches opposition and Mercury dips toward the horizon in ...

Asteroid 9 Metis reaches opposition in the constellation Libra. The main-belt world is visible all night, and best positioned ...

Beyond our solar system, sub-Neptunes — gassy planets larger than Earth but smaller than Neptune — reign as the most common type of exoplanet observed in our galaxy. Despite their prevalence ...

Today I want to talk about something beginning observers tend to overlook. It a process of the human eye called dark ...

The Swan Nebula (M17) glides through the early-morning sky near the border that Sagittarius shares with Scutum and Serpens ...

The most recent measurement of a nearby galaxy cluster is deepening a disagreement about how fast the universe is expanding — ...

On May 7, 1617, the German astronomer David Fabricius passed away. A contemporary of Johannes Kepler, the two frequently corresponded. I thought about him the other day when I was observing the Sun.

Jupiter and Mars shine in the evening, more planets gather in the morning, and the Eta Aquariid meteors join in.