the ring became a symbol of marriage in 1661.
when did the ring became a symbol of marriage?
1661
Na
Na
the appearance of the λ ring changed dramatically when it was observed in forward-scattered light in 1986. in this geometry the ring became the brightest feature of the uranian ring system, outshining the ε ring. this observation, together with the wavelength dependence of the optical depth, indicates that the λ ring contains significant amount of micrometer-sized dust. the normal optical depth of this dust is 10–10. observations in 2007 by the keck telescope during the ring plane-crossing event confirmed this conclusion, because the λ ring became one of the brightest features in the uranian ring system.
rings of uranus