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Happy Friday 13th, y’all

A Friday 13th has to fall in a calendar month that starts on a Sunday. In 2021, August 1 is on a Sunday. So August 13 must fall on a Friday!

Bruce McClure

August 13, 2021

A year with 13 Friday the 13ths?

If we adopted the International Fixed Calendar, we'd have 13 months. And each month would contain a Friday the 13th.

Bruce McClure

August 13, 2021

New odds on asteroid Bennu. Will it strike Earth?

At a press conference August 11, 2021, planetary scientists released new odds on asteroid Bennu and its potential to strike Earth.

Deborah Byrd

August 12, 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

Thank you, Eleanor Imster

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

Editors of 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

July 14, 2021