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How snowflakes get their shape

Depending on the temperature and humidity of the air where the snowflakes form, the resulting ice crystals will grow into a myriad of different shapes.

Tides, and the pull of the moon and sun

Expect higher-than-usual tides following the January 1-2 supermoon. It’s 2018’s closest full moon and happens when Earth is closest to the sun.

Top 7 EarthSky galleries of 2017

EarthSky sends out a year’s worth of thank yous to our friends from around the world who shared images with us throughout the year. Please keep sharing in 2018!

Top 7 EarthSky stories of 2017

Here are 7 of the most-viewed news and feature stories of this past year.

Pine Island iceberg under midnight sun

Satellite view of iceberg B-44 on December 15, near midnight.

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.

Solstice arrives December 21

December solstice 2017 arrives on December 21 at 16:28 UTC. High summer for the Southern Hemisphere. For the Northern Hemisphere, the return of more sunlight!