Earth’s atmosphere extends beyond moon

In fact, these researchers said, the moon flies through Earth’s outermost atmosphere, called its geocorona.

The ozone hole: Closing the gap

After thinning at alarming rates in the 1980s and 90s, the ozone layer over Antarctica is starting to recover.

Canopus: Sky’s 2nd-brightest star

Canopus is the 2nd-brightest star in the sky, and it’s easy to spot on February evenings, if …

See it! Photos of 2019’s biggest supermoon

A selection of photos of the February 18 and 19 full moon – biggest and brightest supermoon of 2019 – from the EarthSky Community.

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Where is the universe’s missing matter?

When astronomers add up the mass of all the normal matter in the present-day universe, about a third of it can’t be found. Where is it?

Watch: Aurora borealis over HAARP

Never-before-seen footage of night skies over the HAARP antenna array in remote northern Alaska.

Tides, and the pull of the moon and sun

Expect higher-than-usual tides a day or two after the February 19, 2019, full supermoon.

Quietly, Regulus ushers in springtime

Regulus, brightest star in Leo the Lion, is now rising in the east after sunset. You might not notice it, but stargazers know that, when Regulus appears in this way, spring is near.

A solar flare 10 billion times more powerful than sun’s

Our sun’s solar flares are an incredible natural phenomenon, but now astronomers have observed a flare on a young star that almost defies belief. It’s 10 billion times more powerful than any seen on our sun!

NOAA announces the arrival of El Niño

This year’s El Niño is likely to be weak, with little influence on weather through early spring, say NOAA forecasters.

Stonehenge mystery solved?

A new study suggests that Europe’s ancient megaliths, including Stonehenge, might have stemmed from a single hunter-gatherer culture in what’s now northwestern France.

Volcanic activity under Mars’s surface?

Mars has long been thought to be a geologically dead world. Could there still be volcanic activity beneath its surface? A subsurface lake at Mars’ south pole suggests that possibility.

Ancient spider fossils have reflective eyes

A remarkable set of fossil spiders found in South Korea display reflective eyes.