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Artificial intelligence probes gravity’s lens

Researchers at SLAC and Stanford have been using brain-mimicking neural networks to analyze the spacetime distortions of gravitational lenses. They say their analysis is 10 million times faster than before.

A new look at ocean worlds

Here’s how the James Webb Space Telescope – successor to Hubble, due to launch in 2018 – will study Jupiter’s moon Europa and Saturn’s moon Enceladus.

September’s birthstone is the sapphire

Like the ruby, the sapphire is a form of the mineral corundum, a normally drab grey mineral.

Floods: Not just a coastal issue

As Hurricane Harvey shows, flooding can happen wherever large storms stall and dump lots of rain. A new study finds development is increasing in flood zones far from any coast.

Space station transits sun during eclipse

There was only one part of Earth where you could catch the International Space Station crossing the sun’s face during the August 21 solar eclipse. These guys saw it, and created this video.

July 2017 tied with 2016 for hottest July

It was another hot July. Last month was tied with July 2016 as the warmest July in the 137 years of modern record-keeping.

Today in science: Earth from the moon

This is the first photo of Earth from the moon, released in 1966. Later, NASA used modern digital technology to restore the photo to reveal more detail.

How ISS astronauts saw the eclipse

The International Space Station passed 3 times on Monday through the moon’s penumbral shadow. Images of the moon’s shadow on Earth, seen from space, acquired by ISS astronauts.

Eclipse photos from EarthSky friends

We received many more wonderful photos of the August 21 eclipse than for any prior event. We love them all, and wish we could post them all! 

Largest-ever Gulf of Mexico dead zone

For 32 years, scientists have tracked the oxygen-depleted waters that appear each summer in the Gulf of Mexico. This year’s dead zone is the biggest yet.