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How to see a whole circle rainbow

It’s possible to see the whole circle of a rainbow – but sky conditions have to be just right. Plus you have to be up high!

The eclipse is just 2 lunations away

As we approach another new moon, astronomer Guy Ottewell shares his profound understanding of lunar cycles and the coming total solar eclipse.

Where’s the moon? Waning crescent

Will you see the moon Friday morning from the Americas? Not likely. New moon will come on June 24, 2017 at 02:31 UTC.

Flying with the world’s fastest bird

The peregrine falcon is the fastest bird – and in fact the fastest animal on Earth – when in its hunting dive. Amazing BBC video here.

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What’s a conjunction?

EarthSky community member Tom Wildoner explains the term “conjunction” in astronomy and provides an illustration.

Global coral bleaching event likely ending

Good news for coral reefs at last! After 3 years, the global coral bleaching event is likely over, scientists say.

Star of the week: Alphecca

Alphecca. Gemma. Alpha Coronae Borealis or simply Alpha Cor Bor. They’re all names for one star – the brightest star in the constellation Northern Crown.

M5, your new favorite globular cluster

Sure, M13, the Great Hercules cluster is wonderful. But some amateur astronomers say this cluster, M5, is even better.

Why hottest weather isn’t on longest day

Solstice 2017 – longest day for us on northern Earth – has passed. But the hottest weather for the Northern Hemisphere is still to come. The reason is called the lag of the seasons.

Sun moves in front of Gemini on June 21

On June 21, 2017, at around 15:00 UTC, the sun moves out of the constellation Taurus and into the constellation Gemini the Twins.

Kepler finds 10 Earth-like exoplanets

NASA’s Kepler space telescope has identified 219 new exoplanet candidates, 10 of which are near-Earth size and in the habitable zone of their star.

Top 10 things about brown recluse spiders

It’s their active season. Here are 10 things to know about these venomous spiders that like to live where we do.

All you need to know: June solstice 2017

It’s that beautiful time of year again in the Northern Hemisphere, when the June solstice – your signal to celebrate summer – is nearly upon us.