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Full-sphere, 360-degree ISS transit

Super cool, interactive image of a transit across the sky of the International Space Station – from May 26, 2017 – by Project Nightflight of Austria.

Auroras over the South Pole

A strong G3-class geomagnetic storm sparked auroras over both poles of Earth this past weekend. Hunter Davis, at the South Pole, captured images.

Clouds that look like ocean waves

They’re called Kelvin Helmholzt clouds, aka billow clouds or shear-gravity clouds, and they look like breaking ocean waves.

Where’s the moon? Waxing crescent

The young moon is back in the west after sunset. Very lovely, and passing near some bright stars on Sunday evening.

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Two big asteroids to pass safely

Radar astronomers are peering toward asteroid 2017 CS, closest on May 29. Another asteroid – 418094 (2007 WV4) – will be closest June 1. Charts here for Saturday night, for 8-inch or larger ‘scopes!

2017’s closest supermoon is May 25

For the 1st time since 2009, a new moon – not a full moon – will be the closest and largest supermoon of a year.

Tides, and the pull of the moon and sun

Expect higher-than-usual tides for a few days following the May 25, 2017 new supermoon.

Today in science: Kennedy’s moon speech

On May 25, 1961, John F. Kennedy gave a stirring speech to a joint session of Congress, inspiring a nation to land humans on the moon with a decade.

What is a supermoon?

By at least 1 definition, the year 2017 has 4 supermoons. Three are new moons and not visible in our sky. The only full moon supermoon of 2017 will come in December.

Mystery light shines near Cygnus A core

When astronomers aimed the Very Large Array at the well-studied galaxy Cygnus A, they were surprised to find a bright new object near the galaxy’s core. Supernova explosion, or a second supermassive black hole?

Top 10 new species 2017

This year’s list includes a spider and an ant with names drawn from popular books, a pink katydid and an omnivorous rat.

Lengths of lunar months in 2017

The shortest lunar month of 2017 starts with the May 25 new moon, which is also the closest new moon of the year. Coincidence?

May 25 new moon is a supermoon

It’s not just any supermoon, but the closest and largest supermoon of 2017. The young moon that follows this new moon will mark the beginning of Ramadan.