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Editors of EarthSky

Why no eclipse every full and new moon?

If the moon orbited Earth on the same plane that Earth circles the sun, we'd have an eclipse at every full and new moon. Here's why we don't.

2022’s 2nd eclipse season has 2 eclipses

There are many cycles in the heavens. We're coming up to a noticeable cycle - the 2nd eclipse season this year - right now. It starts with a solar eclipse.

Heatwave on Jupiter, from its aurora

Scientists have discovered a heatwave on Jupiter, thought to be generated and driven by the giant planet's mighty auroras.

Mercury before sunup in October. Great for Northern Hemisphere!

Watch for Mercury in the east before sunup in October 2022. Mercury reaches greatest elongation on October 8 and remains bright through the end of the month.

Who chooses hurricane names? Plus the 2022 list

The World Meteorological Organization chooses hurricane names several years in advance. Here is the list of hurricane names for 2022.

How to see and enjoy Jupiter’s moons

You can see Jupiter's moons - Io, Europa, Ganymede and Callisto, known as the Galilean satellites - with the help of binoculars or a small telescope.

Pioneer 11 swept past Saturn 43 years ago today

Pioneer 11 was the 1st spacecraft to encounter Saturn. A true pioneer, it paved the way for the 2 Voyagers in 1980 and 1981 plus Cassini from 2004 to 2017.

Return of Sirius signals seasonal change

A sign of the changing season is the return of Sirius before sunup. Want to make sure you've spotted Sirius? The 3 stars in Orion's Belt point to it.

Asaph Hall finds Mars moon Phobos 145 years ago today

On this date in 1877, American astronomer Asaph Hall discovered Phobos, the larger of Mars' 2 moons. He discovered the other moon, Deimos, later that year.

Don Machholz, 1952-2022

We are heartbroken to announce the passing of Don Machholz, discoverer of 12 comets. He was also a writer for EarthSky ... and our friend.