Oberon (moon) at the core–mantle boundary. The eutectic temperature of this mixture is 176 K. If the temperature dropped below this value the ocean would have frozen by now. Freezing of the water would have led to expansion of the interior, which may have also contributed to the formation of canyon-like graben. Still, present knowledge of the evolution of Oberon is very limited. So far the only close-up images of Oberon have been from the "Voyager 2" probe, which photographed the moon during its flyby of Uranus in January 1986. Since the closest approach of "Voyager 2" to Oberon was 470,600 km,
Solar eclipses on the Moon Solar Saros series of the Moon is the equivalent to the Lunar Saros series of the Earth. In a package of Wills's Cigarettes, one of the tobacco cards first issued in 1928 for a few years displays the solar eclipse on the Moon showing the atmospheric ring. This is considered the first depiction of a solar eclipse as seen on the Moon. Solar eclipses on the Moon Solar eclipses on the Moon are caused when the Earth passes in front of the Sun, blocking its light. Viewers on Earth will see a lunar eclipse. The solar eclipses are only seen