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How does octopus change its color?

Incredible color-changing! How – and why – the octopus, squid, and cuttlefish change color.

Asteroid Day 2016 is June 30

Hundreds of events – films, concerts, panels with engineers, scientists and astronauts – about asteroids and how to protect our planet from asteroid impacts.

Known asteroids near Earth today

The first map shows all the known asteroids within one-third of Earth’s distance from the sun today – Asteroid Day – June 30, 2016. Look below for a second map.

Today in science: The Tunguska explosion

On June 30, 1908, an explosion over Siberia killed reindeer and flattened trees. But no crater was ever found. It may have been a small asteroid.

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Join astronomers in tracking asteroids

Sign up to trigger asteroid observations on a global telescope network on Asteroid Day, June 30. Anyone can help! Sign up by 00:00 UTC on July 1.

Where’s the moon? Waning crescent

A waning crescent moon is sometimes called an old moon. It’s seen in the east before dawn.

Surprise! Some mantas are homebodies

Oceanic manta rays have long been thought to migrate great distances. But Indo-Pacific mantas, at least, are more local commuters than long-distance travelers.

Juno on Jupiter’s doorstep

Juno spacecraft on approach to Jupiter! The craft will arrive at Jupiter on July 4, first spacecraft to orbit the giant planet since Galileo (1995-2003).

EarthSky’s meteor shower guide for 2016

2016 will be a great year for watching meteors in late July and early August. A dark sky is best … peak time is late night to dawn.

Coral reefs hit hard by bleaching

“It’s time to shift this conversation to what can be done to conserve these amazing organisms in the face of this unprecedented global bleaching event.”

Spectacular new images of Jupiter

Just days before the Juno spacecraft’s arrival at Jupiter on July 4, astronomers unveiled these VLT images of Jupiter in the infrared.

Today in science: Egypt’s first meteorite

It was the first meteorite in the Egyptian record. Years after the event, scientists concluded through various tests that it came all the way from Mars.

Want to go stargazing?

Where to go stargazing in Georgia, plus a word about a new feature – Best Places to Stargaze, for people around the world – just launched at EarthSky.