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Explanation: What is that large dark spot on Jupiter? It's the shadow of Io, one of Jupiter's largest moons. When Jupiter's moons cross between the Jovian giant and the Sun, they created shadows just like when the Earth's moon crosses between the Earth and the Sun. Also like on Earth, if you were in a dark shadow on Jupiter, you would see a moon completely eclipse the Sun. Unlike on Earth, moon shadows occur most days on Jupiter -- what's more unusual is that a spacecraft was close enough to record one with a high-resolution image. That spacecraft, Juno, was passing so close to Jupiter in late February that nearby clouds and the dark eclipse shadow appear relatively large. Juno has made many discoveries about our Solar System's largest planet, including, recently, rapidly expanding circular auroras.
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
Publications with keywords: Jupiter - Io
Publications with words: Jupiter - Io
See also:
- APOD: 2025 April 2 Á Jupiter and Ring in Infrared from Webb
- APOD: 2025 March 9 Á Cyclones at Jupiters North Pole
- APOD: 2025 February 16 Á Perijove 11: Passing Jupiter
- Stereo Jupiter near Opposition
- APOD: 2024 November 3 Á Jupiter Abyss
- APOD: 2024 May 19 Á Jupiter Diving
- APOD: 2024 April 21 Á Perijove 16: Passing Jupiter