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Science Wire | Apr 24, 2014

First sex-determing genes appeared 180 million years ago

The Y chromosome, which distinguishes males from females at the genetic level, appeared some 180 million years ago, according to a new study published in Nature.

Image credit: SISSA Medialab
Science Wire | Apr 23, 2014

Is spacetime like a liquid?

A very slippery superfluid, that’s what spacetime could be like, say physicists.

Via ESA/C. Carreau
Science Wire | Apr 22, 2014

A dance of supermassive black holes

This is the first time a pair of orbiting, supermassive black holes has been found in an ordinary galaxy.

Science Wire | Apr 22, 2014

Whoa! 26 atom-bomb-scale asteroid impacts since 2000

Most exploded over an ocean, and too high in the atmosphere to do damage, but evidence is mounting that asteroid impacts are more frequent than once believed.

This artist's impression shows NASA's Mercury-bound MESSENGER spacecraft from the instrument side. The instruments on the Mercury orbiter are shielded by a ceramic cloth sunshade. Image Credit: Johns Hopkins University Applied Physics Laboratory
Science Wire | Apr 21, 2014

MESSENGER completes 3,000th orbit of Mercury, sets mark for closest approach

MESSENGER has been getting closer to Mercury since March. It’s now closer to the planet than any spacecraft has been before.

Science Wire | Apr 21, 2014

Make a #GlobalSelfie with NASA on Earth Day, April 22

Step outside and take a picture of yourself. Then post it to social media, using the hashtag #GlobalSelfie. NASA will use your photos to create a mosaic image of Earth.

Tonight | Apr 21, 2014

EarthSky’s top 10 tips for meteor-watchers

You might see a lot or you might not see many, but if you stay in the house, you won’t see any.

Milky Way via Visit Manish Mamtani Photography
Science Wire | Apr 20, 2014

7 ways to celebrate International Dark Sky Week

International Dark Sky Week runs April 20-26, 2014. Learn how to help celebrate and preserve the beauty of the night.

The radiant point for the yearly Lyrid meteor shower is near Vega, brightest star in the constellation Lyra the Harp.
Tonight | Apr 20, 2014

Vega marks radiant point of April’s Lyrid meteor shower

Radiant point for Lyrid meteor shower is near brilliant star Vega in constellation Lyra. In 2014, the shower peaks Earth Day morning, April 22.

Tonight | Apr 19, 2014

Use Big Dipper to find Polaris and Little Dipper

The two outer stars in the bowl of the Big Dipper always point to Polaris, which marks the end of the Little Dipper’s handle.