... A Green Flash from the Sun . ... Luna 9: First Soft Lander . ... But he went home from Cambridge one summer in 1665, thought a lot about the physical nature of the world, and came back two years later with a revolutionary understanding of mathematics, gravitation, and optics. ... These fleeting events are only visible to those in the path of the Moon's shadow as it races across the Earth. ... Five hundred light years from Earth, in the constellation Aquarius, a sun-like star is dying. ...