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Io is 2,000 miles in diameter and orbits 260,000 miles above Jupiter.
Every 42 hours every point on Io goes from high tide to low tide and
the rocky surface rises and falls up to 300 feet or more and lava
(SFC, 5/19/00, p.A17)
1610 Jan 7, The astronomer Galileo
Galilei sighted four of Jupiter's moons. Galileo discov-ered the 1st 3
Jupiter satellites, Io, Europa & Ganymede. He discovered mountains
and valleys on the moon, that Jupiter has a moon of its own, and that
the sun has spots which change. Galileo discovered multiple moons
around Jupiter. He also observed Mars.
(V.D.-H.K.p.200)(SFC, 11/5/96, p.A4)(SFC, 11/29/96,
p.A16)(AP, 1/7/98)(MC, 1/7/02)
1676 Ole Christensen Romer
(Roemer), Danish astronomer, derived a speed of light of 130,000 miles
per second based on his observations of Io, the innermost moon of
1997 Dec 16, Metallic cores inside
Io, Ganymede and Europa and the lack of a similar core inside Callisto
was also indicated.
1998 Oct 13, New photos from the
Galileo satellite showed glowing lava and an arc of light generated by
power surges due to volcanism, magnetic field generation of power and
the grav-ity of Jupiter.
(SFC, 10/14/98, p.A4)
1999 Nov 25, The Galileo
spacecraft flew to within 186 miles of Io's surface. Radiation shut
down its cameras and other equipment 4 hours before the point of
closest approach. The Io volcano called Loki was shown to be the most
powerful in the solar system.
(SFC, 11/27/99, p.A6,7)
2001 Aug 5, The spacecraft Galileo
flew as close as 120 miles above Io’s north pole and cap-tured wisps of
volcanic gas largely composed of sulfur dioxide.
(SFC, 10/5/01, p.D3)