Stars of a Summer Triangle
Rising at the start of a northern summer’s night, these three bright stars form the familiar asterism known […]
NASA
Planet Aurora
What bizarre alien planet is this ? It’s planet Earth of course, seen through the shimmering glow of […]
Star Trails Above Table Mountain
Stars trail above and urban lights sprawl below in this moonlit nightscape from Cape Town, South Africa, planet […]
Triple Conjunction Over Galician National Park
What are those bright objects hovering over the horizon? Planets — and the Moon. First out, the horizon […]
Sharpless 308: Star Bubble
Blown by fast winds from a hot, massive star, this cosmic bubble is huge. Cataloged as Sharpless 2-308 […]
Rings and Seasons of Saturn
On Saturn, the rings tell you the season. On Earth, today marks a solstice, the time when the […]
M64: The Black Eye Galaxy
This big, bright, beautiful spiral galaxy is Messier 64, often called the Black Eye Galaxy or the Sleeping […]
M45: The Pleiades Star Cluster
Have you ever seen the Pleiades star cluster? Even if you have, you probably have never seen it […]
APOD is 20 Years Old Today
Welcome to the vicennial year of the Astronomy Picture of the Day! Perhaps a source of web consistency […]
A Colorful Lunar Corona
What are those colorful rings around the Moon? A corona. Rings like this will sometimes appear when the […]