Weird hexagonal dune field seen on Mars

Mars has sand dunes, as Earth does. But now, NASA’s Odyssey orbiter has revealed something odd: a large dune field shaped roughly like a hexagon. The finding is expected to provide more clues as to how dunes form in Martian winds.

Japan’s Hayabusa2 lands on asteroid Ryugu

The Hayabusa2 spacecraft touched down briefly and successfully on asteroid Ryugu Friday morning, 200 million miles (300 million km) from Earth. It successfully fired a bullet into the asteroid to puff up dust for sample collection.

Rosetta’s comet sculpted by stress

The Rosetta space mission revealed a comet as 2 icy balls apparently stuck together billions of years ago. Now scientists say the comet’s double-lobed structure guided its evolution.

IAU names Chang’e-4 landing site on moon’s far side

The Chinese spacecraft Chang’e-4 made history earlier this year, when it became the first earthly spacecraft to land on the moon’s far side. Now astronomers have named its landing site.

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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.

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!

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