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TRANSCRIPT
1994
High surface concentration of FeO occurs where volcanic
basaltic lavas (mare basalts) flooded giant impact craters.
Low-FeO areas correspond to primordial (highlands) crust of
anorthositic plagioclase (about 50 km in thickness).
Clementine 1994 (analyses
of reflectance variations)
Surface of Mercury
Surface of Venus
Surface of Venus (radar image)
Galileo published his observations in Sidereus Nuncius in March 1610
Galileo originally called the Jupiter's moons the "Medicean planets", after the
Medici family and referred to the individual moons numerically as I, II, III and IV.
Galileo's naming system would be used for a couple of centuries. In the mid-
1800's the names Io, Europa, Ganymede and Callisto, would be officially adopted,
after it became very apparent that naming moons by number would be very
confusing as new additional moons were being discovered.
HST (Hubble
Space
Telescope)
image of
Uranus taken
in 1998
showing
clouds in the
northern
hemisphere.
Atmosphere
mostly
hydrogen
(H2) and
helium (He),
with a small
amount of
methane
(CH4) that
gives it a
blue tint.