Top 7 EarthSky images of 2017

Here are 7 of your favorite images of the year.

Sorry cat-lovers: New study says dogs are smarter

The study - from a self-confessed dog lover - counted cells in animals' brains associated with thinking, planning and complex behavior.

Fossils suggest a universe filled with life

Evidence of life processes found in fossils in 3.5-billion-year-old rocks. Scientists say this work suggests life in our universe is widespread.

Scientists explain insights from ancient Tibetan ice core

A short film about an expedition to Tibet's Guliya Glacier, where scientists drilled a Stone Age ice core going back 600,000 years. Plus a report on what the ice core reveals.

Halo and sundogs over Montana

Ski resorts are the best places to see fine halo displays, like this one. Why so beautiful and why so sparkly? Details here.

Watch: Grand Canyon cloud inversion

A full cloud inversion followed by a snowstorm over Grand Canyon National Park in this gorgeous new time-lapse.

Study: A third of Asia’s glaciers likely gone by 2100

Meltwater from the glaciers supplies water to 800 million people, so that loss would mean serious consequences for water management, food security, energy production.

Arctic report card 2017

The report shows the warming trend that's transforming the Arctic region is persisting. The Arctic shows no sign of returning to reliably frozen region of recent past decades, say scientists.

Exposed to wildfire smoke? 5 questions answered

The intense wildfires in southern California are triggering air quality alerts. What do health experts know about how inhaling smoke affects human health?

Darth Vader horseshoe crab

A 245-million-year-old fossil horseshoe crab, recently discovered in Idaho, has been named Vaderlimulus after Star Wars' Darth Vader. It's easy to see why.

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