July 6, 1998
The light from the farthest visible stars set out on its journey long before your first birthday.
Sizzling Io
Birthday · July 6, 1998
A little universe, just for you
Your date.
Ready to give.
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APOD published July 6, 1998. Full image credits are on the original APOD entry below. A publication-date match, not a photo taken on your date. Independent of NASA.
What's cooking on Io? This active moon of Jupiter is marked with volcanoes spewing lava that is now known to be hotter than any lava on Earth. Above is the highest resolution color-enhanced image yet composed of the most active surface in our Solar System. Features as small as three kilometers are visible. Sulfur compounds cause many of Io's unusual colors, while darker regions are probably composed of silicate rock.