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Video: Summer blue moon

On July 31, the moon becomes full for the second time this month. Modern folklore says the second full moon is “blue.”

This definition of a Blue Moon is a recent thing.

New NASA video on flood prediction

Predicting flooding is notoriously difficult, but predictions are improving. Timely video in light of James Hansen’s prediction this week of catastrophic flooding in New York and other coastal cities before the end of this century.

Video: Moon hoax not

SG Collins explains why the Apollo moon landings on the moon in the late 1960s and early ’70s could not have been faked.

Pluto time around the world

How light is noon on Pluto? This video from NASA and worldwide space fans, replicates Pluto’s noontime light conditions from places all over Earth.

Incredible color-changing! How does octopus do it?

Here’s a different kind of color explosion for the holiday. How and why the octopus, squid, and cuttlefish change colors.

Black hole wakes up after 27 years

On June 15, a monster black hole in the binary system V404 Cygni started showing signs of extraordinary activity that hasn’t happened since 1989. Astronomers around the world are watching the event.

SpaceX rocket explodes after launch

An unmanned SpaceX Falcon 9 rocket, carrying a Dragon spacecraft loaded with supplies for the International Space Station (ISS), exploded Sunday (June 28, 2015) shortly after liftoff from Cape Canaveral in Florida. The astronauts aboard ISS have about four months of supplies left, but the failure has dealt a blow to NASA, which has had three failed shipments of cargo to ISS in the past eight months.

Can a human singing voice shatter glass?

If you run a damp finger along the rim of a glass, you might hear a faint, ghostly hum – the resonant frequency of the glass. To shatter the glass, a singer’s voice has to match that frequency, or pitch, at an extremely loud level, and the glass must have microscopic defects.

Video: Brainy octopus and its coconut

We can’t get enough of the coolness of octopuses here at Earthsky. Watch what this octopus does with coconut shells.

Sixth mass extinction is happening now

We are entering a mass extinction that threatens humanity’s existence, says a new study. Earth’s species are disappearing faster than at any time since the dinosaurs’ demise, some 15 to 100 times faster than the normal rate between past mass extinctions.