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1. (countable) The universe regarded as a system with harmony and order.
   1. (by extension) A harmonious, ordered whole.
2. (uncountable) Harmony, order.

[...]

1. Any of various mostly Mexican herbs of the genus Cosmos having radiate heads of variously coloured flowers and pinnate leaves. [...]

The American astronomer Carl Sagan, who co-wrote and narrated the award-winning television documentary Cosmos: A Personal Voyage (1980–1981) and authored its companion book Cosmos (1980), was born on this day 90 years ago in 1934.