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.
Posts by EarthSky
A very slippery superfluid, that’s what spacetime could be like, say physicists.
This is the first time a pair of orbiting, supermassive black holes has been found in an ordinary galaxy.
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.
MESSENGER has been getting closer to Mercury since March. It’s now closer to the planet than any spacecraft has been before.
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.
You might see a lot or you might not see many, but if you stay in the house, you won’t see any.
International Dark Sky Week runs April 20-26, 2014. Learn how to help celebrate and preserve the beauty of the night.
Radiant point for Lyrid meteor shower is near brilliant star Vega in constellation Lyra. In 2014, the shower peaks Earth Day morning, April 22.
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.