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Oceans Under Jupiters Callisto
<< Yesterday 31.07.2001 Tomorrow >>
Oceans Under Jupiters Callisto
Credit: Voyager 1, NASA
Explanation: Why does Jupiter's moon Callisto alter the magnetic field of Jupiter in its vicinity? Callisto itself does not have a strong magnetic field. One possible answer is that Callisto harbors sub-surface oceans of electrically conducting salt-water. This hypothesis was bolstered recently by a new analysis of how Callisto creates and dissipates heat. Callisto is thought to create heat by the radioactive decay of internal rock -- a process that keeps the Earth's mantle molten. Callisto may not be able to dissipate this heat very efficiently, however, as it has thick layers of ice and rock on its surface. Perhaps this heat is enough to keep sub-surface water from freezing into ice. With this hypothesis, Callisto joins two other of Jupiter's moons, Europa and Ganymede, in candidates for sub-surface oceans. Callisto's oceans, however, might prove too hostile to support Earth-like life.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Russkii tekst
Based on Astronomy Picture Of the Day
Publikacii s klyuchevymi slovami: vnezemnaya zhizn' - Yupiter - okean - Kallisto - Jupiter - Callisto - life
Publikacii so slovami: vnezemnaya zhizn' - Yupiter - okean - Kallisto - Jupiter - Callisto - life
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