Line drawing of asteroid orbit in the inner solar system.

The day the asteroid might hit

For the 1st time, the European Space Agency will cover progress of a hypothetical asteroid impact scenario – this week – live via social media, from the heart of the Planetary Defense Conference in Washington, DC.

Artist's depiction of 8 human skull fossils.

Human history in your face

When you look in a mirror, the face you see is the result of millions of years of human evolution. Here’s an interview with an expert discussing how and why our modern human faces evolved to look as they do today.

Why observe Earth Day on April 22?

April 22 is the date of Earth Day in part because of Arbor Day, an earlier observance. The focus of Earth Day 2019 is protection of Earth species.

A basket full of colored Easter eggs.

Why is Easter so late this year?

Easter is this Sunday. Astronomer Guy Ottewell explains why it’s a late Easter, but not the latest it can be.

Moon’s south pole possible landing site

NASA hopes to send astronauts to the surface of the moon in 5 years, and has planned a landing site where no human has yet been: the lunar south pole.

Why does the moon seem to follow me?

Here’s something you – or your kids – might have noticed: When you’re in a moving car, earthly objects get left behind, but the moon seems to follow. Why?

Video still of April 6, 2019 meteor.

Another asteroid disintegrates over Russia

A bright meteor was caught in many dashcam videos – in broad daylight – on April 6, 2019, over the Russian city of Krasnoyarsk. See a video compilation here.

Identical twin male astronauts sitting next to each other.

Does a year in space make you older or younger?

The NASA Twins study – featuring astronaut twins Scott and Mark Kelly – was the perfect space experiment. Scott spent a year in space aboard the International Space Station. Mark remained on Earth. The results?

Check out this peregrine falcon webcam

An EarthSky community member – Jody Kuchar – alerted us to the webcam, which is based in Wisconsin. Thank you, Jody!

Black hole image confirm Einstein’s relativity theory?

Einstein’s theory was confirmed in 1919, when British astronomer Sir Arthur Eddington measured the bending of starlight around the sun during a total solar eclipse. And it’s been re-confirmed since. How about now?