Enjoying EarthSky? Subscribe.

123,434 subscribers and counting ...

Human World

Inferred distribution of dark matter superimposed in purple over a Hubble Space Telescope image of the galaxy cluster Abell 1689. Image via NASA, ESA, E. Jullo (JPL/LAM), P. Natarajan (Yale) & J-P. Kneib (LAM)
Science Wire | Nov 09, 2014

Curious about dark matter? Three scientists answer your questions

Why do you bet on axions or WIMPs?
If you find dark matter, what are the next steps?
Will we need a whole new “Dark Standard Model”?
What’s it like searching for something you may never find?

Image via NASA/NOAA
Blogs | Nov 08, 2014

NASA quells rumor: Days of darkness in December? Of course not

Heard the rumor that “NASA says” Earth will experience several days of total darkness in December 2014? Not true, of course.

Photo credit: Chris Ford/Flickr
Science Wire | Nov 05, 2014

Watch the pulse of New York City, measured in tweets

Scientists observe the daily heartbeat of different areas of New York City, through the lens of Twitter.

Image via Shutterstock
Blogs | Nov 04, 2014

Collect call from E.T. Do you accept the charges?

Odds are there’s intelligent life out there somewhere among the stars. Why haven’t we heard from an alien civilization? One viewpoint, in this article. What do YOU think?

Genes and proteins run biological clocks that help keep daily rhythms in synch.  Image credit: Wikimedia Commons
Science Wire | Nov 03, 2014

Cool facts about your biological clock

Feeling tired after turning the clock back? That’s because the internal clock that controls your circadian rhythms needs time to adjust.

Clock image via Shutterstock
Blogs | Nov 01, 2014

Remember to set your clocks back on November 2, 2014

Remember to fall back by setting your clocks back one hour, as Daylight Saving Time ends Sunday morning.

Photo via Kurt Magoon on Flickr
Tonight | Oct 31, 2014

Halloween derived from ancient Celtic cross-quarter day

Yes, Halloween is an astronomical holiday.

Marfa lights viewing area this way
Blogs | Oct 31, 2014

Ghost lights: Believe if you dare

In folklore, ghost lights were strange lights seen over swamps or bogs. But we’re more sophisticated today. Aren’t we?

Screen Shot 2014-10-28 at 4.42.41 PM
Science Wire | Oct 31, 2014

Why do we scream?

Despite our fascination with screams, science knows relatively little about them. The psychology of screams …

Transmission electron micrograph of an Ebola virus virion. Image credit: Frederick Murphy / CDC.
Science Wire | Oct 29, 2014

Ebola is at least 16 million years old, says study

Ebola’s first documented outbreak was in 1976. But the Ebola virus family has been around for 16 to 23 million years, says new research.