Enjoying EarthSky? Subscribe.

129,796 subscribers and counting ...


Amazing 44-second meteor might be space debris reentry

An impressive and slow meteor was visible from Puerto Rico on the early hours of Sunday, December 28, 2014. The biggest astronomical society on the island, Sociedad de Astronomía del Caribe (SAC), had reports confirming several witnesses of the event. A video from their meteor cameras shows the object crossed the whole sky from SW to ENE and lasted 44 seconds.

Video: Does being cold make you sick?

Being cold can’t give you a cold … or can it?

Read the message your dog sends with his tail

Tail-wagging is a reflection of what’s happening in your dog’s brain. Learn to read your dog’s tail signals, and you’ll know if he’s happy … or stressed.

What causes Death Valley’s sliding stones to move?

The video above shows a famous sliding stone of Death Valley’s Racetrack Playa in motion. See it? It’s the big rock in the foreground. Watching this video, you become one of the first people on Earth to see a sliding stone in motion. Although their tracks across Racetrack Playa – a dry lake bed in Death Valley – have been observed and studied since the early 1900s, no one had ever seen the stones in motion … until recently. What’s more, the researchers who captured this video say they now know what causes the stones to move.

This date in science: Earthrise from the moon

December 24, 1968. On this date, three astronauts had recently become the first human beings to leave our home planet and travel to another body in space. They all later said the most important thing they discovered was Earth. Today is the anniversary of the famous Apollo 8 “Earthrise” photograph captured by those astronauts. This video gives you a front row seat on the view seen by lunar astronauts in the Apollo 8 mission, as, during a roll maneuver of their craft, they peered from a window and noticed Earth ascending over the lunar horizon.

Science fireplace

Warm up your holidays with this crackling science fireplace. It takes about an hour for the whole log to burn.

Watching solstices and equinoxes from space

How sunlight falls on Earth’s surface during the solstices and equinoxes, as seen from geosynchronous orbit.

Video: 100 trillion microorganisms that live on and in you

There’s a unique collage of more than 100 trillion microorganisms living on and in you that are essential to your life and part of what makes you, well, you. It’s your microbiome.

Voyager spacecraft rides tsunami wave in interstellar space

Voyager 1 might still be caught what scientists have described as a cosmic “tsunami wave,” a shock wave that first hit the probe in February. You can hear the eerie interstellar vibrations in a video, courtesy of NASA.

Probing the Big Bang of bird evolution

In this past week, the Avian Phylogenomics Consortium – 200 scientists, 80 institutions, 20 countries – began releasing its first results on nothing less than the origins of birds. This consortium has worked for the past four years on the whole genome sequencing of 48 bird species. Their results – which are expected to change the way we think about bird diversity – are being reported nearly simultaneously in 23 journal papers.