Early Earth was a hellscape of molten lava and barren rock, bombarded by meteors, with no atmosphere at all. How did our familiar blue sky – the thin, life-giving band of gasses protecting our ...

When the billions of stars comprising the Milky Way, our home galaxy, appear especially vibrant as the band arcs across the night sky, it’s a photo op ...

The largest two-dimensional map of the sky over Earth ever created just got even larger and is now covering almost half the sky over Earth. The map created with data from a six-year-long ...

Early-rising and late-night stargazers in the Northern Hemisphere have a great opportunity right now to see Sirius, Earth’s brightest nighttime star. Sirius can be seen shining high in the sky ...

Mars SKY AT Viewed from above the solar system, the seven planets will fall within Earth’s line of sight at sunset, and will not be obscured by the sun. Viewed from above the solar system ...