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1st quarter moon is February 23

But the moon might look closer to 1st quarter to you on February 22.

Violent blasts from Indonesia’s Sinabung volcano

Mount Sinabung on the Indonesian island of Sumatra erupted violently on February 19, 2018. See video of the dramatic first moments of the eruption.

Amateur astronomer captures a supernova’s 1st light

Supernovae – exploding stars – are unpredictable. But an amateur astronomer in Argentina happened to catch one just as it began to explode. “It’s like winning the cosmic lottery,” one astronomer said.

Juno’s look at Jupiter’s swirling clouds

See swirling cloud formations in the northern area of Jupiter’s north temperate belt in this new view taken by NASA’s Juno spacecraft.

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Sirius is Dog Star and brightest star

February evenings are a grand time to see Sirius. It’s hard to miss as the brightest star in Earth’s sky. How to spot it, mythology, science, here.

Will you see the Humanity Star?

The debate surrounding the Humanity Star. Is it possible to see? Can you see it from your location? How to try to see it, if it’s visible, here.

Green moon on April 20, 2018? Nah

The green moon rumor started in 2016. Now it’s back. It’s a joke, y’all. We’re not going to have a green moon on April 20, 2018. This joke has its roots (ahem) in cannabis culture.

Happy birthday, Nicolaus Copernicus

Why do we love him? Because he broke open the medieval idea of an enclosed, Earth-centered universe and set us on course for a new cosmology.

Copernicus’ revolution and Galileo’s vision, in pictures

It’s not a stretch to say these astronomers fundamentally changed the way we think about our place in the universe. We can gain insights into how this profound shift unfolded by looking at their actual notes.

Return of the young moon, and Venus

Two lovely and hopeful signs in the sky … the returning young moon and Venus. Photos here from the EarthSky community.

Hubble sees Neptune’s dark storm die

In the 1980s, Voyager 2 discovered a dark storm in Neptune’s dense atmosphere, and now the Hubble Space Telescope is tracking Neptune’s storms. More in this NASA video.

Where narwhals like to hang out

Narwhals are among the ocean’s most elusive creatures. But new research may shed light on where these enigmatic marine mammals like to congregate.

ALMA telescope spies a supermassive black hole’s spinning disk

For decades, astronomers have been talking about of galaxies with supermassive black holes at their cores. Now they say they’ve clearly confirmed a black hole’s encircling, dusty, spinning disk of gas.