Astronomy Picture of the Day · April 20, 2001

Io: Moon Over Jupiter

The Astronomy Picture of the Day for April 20, 2001 is “Io: Moon Over Jupiter,” an image. It is credited to Credit: Cassini Imaging Team , Cassini Project , NASA. The original explanation runs about 152 words.

From the explanation

“How big is the Jovian moon Io ? The most volcanic body in the Solar System, Io (usually pronounced “EYE-oh”) is 3,600 kilometers in diameter, about the size of planet Earth’s single large natural satellite .”

— APOD editors, April 20, 2001

Read the full explanation on science.nasa.gov

At a glance

Date: April 20, 2001
Type: Image
Credit: Credit: Cassini Imaging Team , Cassini Project , NASA
Copyright: No copyright notice on the entry. Check the credited institution’s own usage rules before reusing it.
Explanation length: About 152 words

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Topics in this entry

The Moon Jupiter

Topics are matched from words in the title and explanation.

On this day: April 20 in other years

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Source

Astronomy Picture of the Day, April 20, 2001 — science.nasa.gov/image-article/apod-2001-april-20-io-moon-over-jupiter

Copy taken Oct 28, 2026, 2:39 AM EDT. The image and explanation belong to their creators. OpenOrbit is not affiliated with or endorsed by NASA.