238,585 subscribers and counting ...
Cloud streets are long rows of cumulus clouds that are oriented parallel to the direction of the wind. Check out these cool images!
Alien visitation? No. Lunar X is an example of how lighting and topography can combine to produce a pattern that seems familiar to the human eye.
They are an ethereal display of colored lights shimmering across the night sky – the aurora borealis or northern lights. What causes them?
New Year’s Day is a civil event. Its date isn’t precisely fixed by any natural seasonal marker.
December has two birthstones, turquoise and zircon.
Jupiter’s gravity slings long-period comets out of harm’s way, while nudging some asteroids closer to Earth. And, in 1770, Jupiter took aim on Earth – but missed.
Supervolcanoes – massive eruptions with potential global consequences – don’t appear to follow the conventional volcano mechanics, say researchers.
A big El Niño is developing in 2015, say scientists. This NASA video explains El Niño and its impact on the marine food web.
November’s birthstone, the topaz, was thought to have the power to cool boiling water, as well as excessive anger.
What if an advanced civilization could collect all of the energy emitted by its star?
Don’t miss moon and Saturn January 24
Favorite photos from this weekend