New Delhi, April 6 -- Carl Sagan's work in astronomy is often associated with unlocking the grand mysteries of the universe and the search for extraterrestrial life.

However, Sagan himself believed in using the vastness of space to highlight the fragility and unity of human existence, contrary to many who viewed space exploration purely as a quest for domination.

"The Earth is a very small stage in a vast cosmic arena. Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot. Think of the endless cruelties visited by the inhabitants of one corner of this pixel on the scarcely distinguishable inhabitants of some other corner, how ...