Alan Stern on the moons of Pluto

Fans of Pluto celebrated the discovery of its fifth moon in July of 2012. Astronomer Alan Stern was on the discovery team that found Pluto’s new moon.

Massive black holes found at center of the Milky Way

A research team has discovered masses thought to be "seeds" that form and grow massive black holes at the center of the Milky Way Galaxy.

Luciano Iess: Liquid ocean on Saturn’s moon Titan

Cassini spacecraft observation of "tides" in the solid surface of Titan suggest that this large moon of the planet Saturn has an ocean below ground.

Asteroid size of city block to sweep past July 22

There's nothing to fear from asteroid 2002 AM31. It'll pass within 14 times the moon’s distance from Earth. But you might enjoy watching it sweep past!

Lightning on Saturn found on the day side!

Scientists say this lightning on Saturn is approximately 100 miles (200 kilometers) in diameter when it exits the tops of the clouds.

Exoplanet smaller than Earth, only 33 light-years away

The little exoplanet UCF-1.01 might be the nearest world to our solar system that's smaller than our home planet.

Auroras widely seen July 14. Chance on July 15, too

A powerful X-flare on the sun on July 12 was aimed directly toward Earth. Its effects arrived July 14 with shimmering auroras. Aurora alert!

Jupiter, Saturn and Venus might have lightning sprites, too

Lightning sprites on alien worlds like Jupiter, Saturn and Venus. Cool!

X-flare from giant sunspot group 1520

Giant sunspot group 1520 - which spans about 10 Earth diameters on the sun's surface - emitted an X-flare on July 12 at 1653 UTC.

Frank Hill: Future sunspot drop, but no new ice age

Frank Hill told EarthSky that -- while his team did suggest a drop in solar activity beginning around 2019 -- they did not suggest Earth would cool as a result.