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Summer Triangle on winter evenings
How long into Northern Hemisphere winter will you be able to see the Summer Triangle?
December 22, 2017
Halo and sundogs over Montana
Ski resorts are the best places to see fine halo displays, like this one. Why so beautiful and why so sparkly? Details here.
December 21, 2017
Astronomers spy a red giant’s bubbling surface
For the 1st time, astronomers have seen giant bubbles roiling up to the surface of a star beyond our solar system. Each great bubble is so huge it would extend from our sun to Venus.
December 20, 2017
Big Dipper over Murrieta, California
The Big Dipper is low in the sky in the evening hours at this time of year. But you can see it after midnight. Janet Aviles caught it earlier this week, ascending in the northeast.
December 20, 2017
Watch: Grand Canyon cloud inversion
A full cloud inversion followed by a snowstorm over Grand Canyon National Park in this gorgeous new time-lapse.
December 19, 2017
Double green flash
Green flashes are best seen over ocean horizons like this one, and, this time, the California wildfires did something helpful.
December 19, 2017
No big planets at Alpha Centauri, but maybe small ones
"Because Alpha Centauri is so close, it's our first stop outside our solar system. There are almost certain to be small, rocky planets around Alpha Centauri A and B."
December 18, 2017
Opportunity rover on Mars still going strong after 14 years
Opportunity has been exploring Mars for 14 years. It and its solar panels recently survived the winter darkness in its location and are now facing a possible planet-wide dust storm in 2018.
December 18, 2017
21st century’s longest lunar month starts December 18
Lunar months are roughly 29.5 days. The upcoming one will be 7 hours longer than the mean and this century's longest lunar month. Why?
December 17, 2017
