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700 million years after the formation of the Earth and Moon.
Only when the Apollo astronauts finally stepped out onto the surface of the Moon was the mystery of its dark patches finally revealed - they're ancient impact basins that filled with lava 700 million years after the formation of the Earth and Moon. scientists now think this late heavy bombardment might have come from a time when the giant planets in the solar system were changing orbits; Jupiter moved inward, while Saturn, Uranus and Neptune headed away from the Sun. The gravitational side-effect of this shuffling sent a rain of smaller objects that struck the Moon and other planets in the Solar System.
Cassini has turned up an unusual "hotspot" on Titan that Astronomers don't have an explanation for... yet. The 483-km (300-mile) wide region can been seen in both visible light and infrared. This spot could be from an asteroid impact, cryovolcanism, or some kind of atmospheric process - maybe a crater is holding clouds in place, or unusual materials on the surface. Cassini will visit Titan during its nighttime in July, 2006, and view the region again in Infrared to see it it's actually hot.
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