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Melting sea ice leaves polar bears hungry

“Sea ice really is their platform for life. They are capable of existing on land for part of the year, but the sea ice is where they obtain their main prey.”

Today in science: Discovery of Neptune

Neptune is the planet discovered with mathematics.

Last quarter moon is September 23

Fun time to see a last quarter moon: just after it rises, shortly after midnight. Then the lighted portion points downward, to the sun below your feet.

Late September-October planet guide

Use the moon to catch Mercury before dawn in late September, 2016. Then watch as Jupiter pairs with Mercury in the picturesque glow of dawn on October 11.

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All you need to know: September equinox

2016’s September equinox arrives on the 22nd. Happy autumn (or spring)!

A Chinese perspective on autumn

Autumn is connected in Chinese thought with the direction west, considered to be the direction of dreams and visions.

Today in science: Michael Faraday

Meet Michael Faraday, the man behind the electric motor and theory of electromagnetism.

Astro festivals, star parties, workshops

Looking for something to do on the weekends? At star parties, amateur astronomers with telescopes will show you the night sky. Find one near you …

Dwarf galaxies and dark matter update

Standard cosmology calls for many more dwarf galaxies than we see. A new computer simulation suggests we might not need so many dwarf galaxies, after all.

Star of the week: Fomalhaut

Fomalhaut is sometimes called the Loneliest Star. Its planet, Fomalhaut b, was the first planet beyond our solar system to be visible to the human eye.

Satellite sees 3 California wildfires

There were more than a dozen wildfires burning in California, as of September 20.

Why Earth has 4 seasons

Some assume our planet’s changing distance from the sun causes the change in the seasons. That’s logical, but not the case, for Earth.

Where’s the moon? Waning gibbous

The Northern Hemisphere’s Harvest Moon has come and gone. The moon is now waning and rising later at night.