A Century of Sky, Digitized

The Harvard College Observatory’s glass plates, which record a century of changes in the sky, has now been converted into digital form.

Are These Baby Pictures of the Milky Way?

Newly detected stellar aggregations in the Milky Way could be the remnants of protogalaxies from its formation — or just resonances with the galaxy’s bar.

April Fool’s on the arXiv, 2024 edition

On this April 1st, astronomers revealed fascinating discoveries inspired by astrology, pasta, Star Wars, and flamingos.

This Week's Sky at a Glance, April 5 – 14

Mercury has faded and set. Watch the Pleiades settle a little closer to Jupiter until they both become lost in twilight late this month. Shortly after nightfall around this time of year, Arcturus is rising in the east stands just as high as Sirius is descending in the southwest.

What Will the Sun's Corona Look Like During Totality?

The eclipse is coming up, and already scientists have predicted the appearance of the solar corona on the big day.

Where to Watch the Total Solar Eclipse Online

Watch the total solar eclipse — alongside interviews with scientists and astronauts — with these livestreams.

11 Things to Take With You the Day of the Solar Eclipse

You might have your eclipse-viewing plans all worked out, but have you thought about all the other things you might need?

Awe in the Shadow of a Partial Eclipse

A partial eclipse — Eclipse Lite, if you will — can also offer a sense of wonder, albeit on a smaller scale than totality.

April Podcast: Planets in Transition

April’s evening skies offer plenty of stars to check out. However, aside from Jupiter low in the west, planets are in short supply. Our latest Sky Tour podcast helps you track down Mars, Saturn, and much more during April.

Eclipse Solar Desde el Zoológico Guadalajara

Transmisión del Eclipse solar del 8 de abril a la par de la narración del cambio de comportamiento de algunas especies de animales residentes en el Zoológico Guadalajara.

The Great 2024 Eclipse Guide



The Great 2024 Eclipse is a 64-page, full-color illustrated guide to the April 8, 2024, total solar eclipse. Everything you need to prepare for this awe-inspiring event is at your fingertips in this special issue.