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August 2021 has a Friday 13th

Any calendar month starting on a Sunday always has a Friday 13th. In 2021, August 1 is on a Sunday. August 13 must fall on a Friday!

Bruce McClure

August 1, 2021

A Dyson sphere harvests the energy of stars

Dyson spheres are named after inventor Freeman J. Dyson. A Dyson sphere is a megastructures that civilizations could use to harness the power of stars.

Deborah Byrd

July 30, 2021

Caroline Herschel Medal to honor women astronomers

Learn about the Caroline Herschel Medal, meant to honor the contributions of women astronomers. And meet the women who helped shape astronomy.

EarthSky Voices

July 29, 2021

Major 8.2-magnitude earthquake rocks Alaska

Sirens sounded across Alaska's Kodiak island last night, after an 8.2-magnitude earthquake prompted tsunami warmings.

Deborah Byrd

July 29, 2021

9 weird transients from 1950 still unexplained

Astronomers in Sweden want to solve the mystery of 9 weird transients, glimpsed in a photographic plate acquired at Palomar Observatory in 1950.

Paul Scott Anderson

July 25, 2021

Astronomy art: Voices of Apollo 11

Voices of Apollo 11 is an image of the moon, made of the words transmitted from the moon by Apollo 11 astronauts. Astronomy artist J-P Metsavainio created it.

Theresa Wiegert

July 19, 2021

How to spot ISS in your sky

The International Space Station has been orbiting our planet since 1998. Click here to learn how to spot ISS in your sky.

Deanna Conners

Lia De La Cruz

July 16, 2021

Thank you, Eleanor Imster

Say good-bye to Eleanor Imster, a fixture at EarthSky since 1995.

EarthSky

July 14, 2021

The billionaire space race and the Karman line

The billionaire space race ramped up at Richard Branson's successful flight to the edge of space on July 11, 2021, as 2 spaceflight companies jostled for bragging rights.

Lia De La Cruz

Deborah Byrd

July 14, 2021