Astronomy Picture of the Day · October 12, 2025

All the Water on Europa

The Astronomy Picture of the Day for October 12, 2025 is “All the Water on Europa,” an image. The picture is copyrighted by its creator (Illustration Credit & Copyright: Kevin Hand ( JPL/Caltech ), Jack Cook ( Woods Hole Oceanographic Institution ), & Howard Perlman ( USGS )). The original explanation runs about 164 words.

Earth without water is shown on the right, while Jupiter's moon Europa is shown on the left. Superposed on each object is a blue sphere estimating the amount of water each object contains. The blue spheres are about the same size. Please se — Credit: Illustration Credit & Copyright: Kevin Hand ( JPL/Caltech ), Jack Cook ( Woods Hole Oceanographic Institution ), & Howard Perlman ( USGS ) Copyrighted Shown from science.nasa.gov. Not hosted by OpenOrbit.

From the explanation

“How much of Jupiter’s moon Europa is made of water? No one is sure, but probably a lot.”

— APOD editors, October 12, 2025

Read the full explanation on science.nasa.gov

At a glance

Date: October 12, 2025
Type: Image
Credit: Credit: Illustration Credit & Copyright: Kevin Hand ( JPL/Caltech ), Jack Cook ( Woods Hole Oceanographic Institution ), & Howard Perlman ( USGS )
Copyright: Copyrighted by the credited creator. Ask the copyright holder before reusing it.
Explanation length: About 164 words