Human World
Futuristic space concrete uses astronauts’ blood
Scientists in the U.K. have developed a kind of "space concrete" using dust and human blood that could be used for future human habitats on Mars or the moon.
Human World
Pablo Neruda, a poet who embraced cosmic beauty
Pablo Neruda was a famous Chilean poet who wrote: "Every day you play with the light of the universe." Neruda died on this date, September 23, in 1973.
Astronomy Essentials

Equinox sun is over Earth’s equator

The equinox is September 22. From around the world on the day of an equinox, the equinox sun pretty much rises and sets due east and west.
Human World

Bible story of Sodom revisited. Was it a meteor strike?

The Bible story of Sodom and Gomorrah describes ancient cities destroyed for their wickedness. New research suggests a meteor impact instead.
Brightest Stars

Gamma Cephei, aka Errai, a future North Star

Gamma Cephei - or Errai - is a binary star system that will someday be Earth’s North Star. Gamma Cephei is home to the first exoplanet ever discovered.
Human World

La Palma volcano lava headed to sea

The La Palma volcano has forced thousands to evaculate. Its lava is flowing through streets, filling swimming pools, headed to the sea.
Today's Image

2021’s Harvest Moon: Favorite photos

Photos of 2021's Harvest Moon from the EarthSky Community. Our thanks to all who contributed! Check out community page for more.
Astronomy Essentials

Year’s fastest sunsets happen around equinoxes

The year's fastest sunsets are at the equinoxes, and the slowest are at the solstices. We're talking about the minutes needed for the sun to sink below the horizon.

Asteroid 2021 SG came from the sun’s direction

Asteroid 2021 SG - 4 times the diameter of 2013's Chelyabinsk meteor - passed near Earth without being previously detected on September 16, 2021.
Astronomy Essentials

Harvest Moon 2021: All you need to know

In 2021, the Northern Hemisphere's Harvest Moon falls on September 20, or less than 2 days before the autumn equinox.