Anubhav Yadav's video: Carl Sagan on Pale Blue Dot Earth image from Voyager 1

Pale Blue Dot is an image of the Earth taken by Voyager 1 from 6 billion kilometers on 14 February 1990. The apparent size of the Earth is less than a pixel; The planet appears as a small point against the vastness of space, between the band of sunlight reflected by the camera of Voyager 1, which had completed its primary mission and was abandoning the solar system, was ordered by NASA to turn its camera and take one last photo of Earth in a great expanse of space, at the request of astronomer and author Carl Sagan Went. The term "pale blue dot" was coined by Carl Sagan Pale Blue Dot is part of the Family Portrait series of blue dot images. Of the 640,000 individual pixels that compose each frame, the Earth takes 0.12 (less than one pixel) of a pixel according to NASA. The light band across the photo is an artifact, a result of the sun reflecting off the camera and parts of its canopy, due to the proximity between the sun and the Earth. The Earth appears as a blue dot mainly due to scattering of sunlight in its atmosphere. In Earth's air, short wavelength visible light such as blue light is scattered to a greater extent than long wavelength light such as red, which is why the sky appears blue from Earth. The ocean contributes to the Earth's faults, but to a lesser extent than scattering. The Earth is dotted with light blue rather than dark blue, because the white light reflected by the clouds combines with the scattered blue light. In his book, Pale Blue Dot, Carl Sagan comments on what he sees as the greater significance of the photograph, writing: Look again at that dot. That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every "superstar," every "supreme leader," every saint and sinner in the history of our species lived there--on a mote of dust suspended in a sunbeam. 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 frequent their misunderstandings, how eager they are to kill one another, how fervent their hatreds. Our posturings, our imagined self-importance, the delusion that we have some privileged position in the Universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark. In our obscurity, in all this vastness, there is no hint that help will come from elsewhere to save us from ourselves. The Earth is the only world known so far to harbor life. There is nowhere else, at least in the near future, to which our species could migrate. Visit, yes. Settle, not yet. Like it or not, for the moment the Earth is where we make our stand. It has been said that astronomy is a humbling and character-building experience. There is perhaps no better demonstration of the folly of human conceits than this distant image of our tiny world. To me, it underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we've ever known. — Carl Sagan