An Airglow Fan from Lake to Sky
Why would the sky look like a giant fan? Airglow. The featured intermittent green glow appeared to rise […]
Astronomy
Twin Galaxies in Virgo
Spiral galaxy pair NGC 4567 and NGC 4568 share this sharp cosmic vista with lonely elliptical galaxy NGC […]
Sharpless 308: Star Bubble
Blown by fast winds from a hot, massive star, this cosmic bubble is huge. Cataloged as Sharpless 2-308 […]
Wide Field View of Great American Eclipse
Only in the fleeting darkness of a total solar eclipse is the light of the solar corona easily […]
Ultima Thule from New Horizons
How do distant asteroids differ from those near the Sun? To help find out, NASA sent the robotic […]
The Umbra of Earth
The dark, inner shadow of planet Earth is called the umbra. Shaped like a cone extending into space, […]
Moon Struck
Craters produced by ancient impacts on the airless Moon have long been a familiar sight. But only since […]
Matterhorn, Moon, and Meteor
Fans of planet Earth probably recognize the Matterhorn in the foreground of this night skyscape. Famed in mountaineering […]
Orion over the Austrian Alps
Do you recognize this constellation? Through the icicles and past the mountains is Orion, one of the most […]
Lunar Eclipse over Cologne Cathedral
Why would a bright full Moon suddenly become dark? Because it entered the shadow of the Earth. That’s […]