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Double green flash

Green flashes are best seen over ocean horizons like this one, and, this time, the California wildfires did something helpful.

Geminid meteor, rising moon and tarantula

Spiders like stars, too.

Gaia’s view of Large Magellanic Cloud

The Large Magellanic Cloud (LMC), one of the nearest galaxies to our Milky Way, as viewed by ESA’s Gaia satellite after its first 14 months of operations.

Sirius in many colors

When you see the sky’s brightest star – Sirius – low in the sky, you’re seeing it shine through an extra thickness of Earth’s atmosphere. At such times, its colorful flashing might surprise you.

A grand year for the Geminids

The 2017 Geminid meteor shower was thought to have a better-than-average chance of producing a rich display, since the Geminids’ parent body – a strange rock-comet called 3200 Phaethon – is nearby. And so it was! Photos here.

Long-lasting moon halo

Halos around the sun or moon are caused by ice crystals, like those in high cirrus clouds. Sometimes you can’t see clouds, but – in these photos – you can.

Shining sea and sky

“When phytoplankton come near the beach, you can see this amazing scene. There is light in the sea and sky,” said Mohammad Rouhbakhsh of Iran, who captured this image.

California in flames

According to the California Department of Forestry and Fire Protection, the 2017 California wildfire season is the worst on record.

Asperitas clouds over Tenerife

Meet Earth’s newest named cloud, the asperitas cloud, 1st new addition to the International Cloud Atlas in over half a century.

Christmas lights and the king tide

Mimi Ditchie captured this photo at low tide on Monday – the day of the king tide at Pismo Beach, California – following Sunday’s supermoon.