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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.
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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. 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. The Earth is a very small stage in a vast cosmic arena. 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. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. Here are some excerpts, of which every word needs to be savored and reflected upon no one else but Sagan can bring this perspective, with such few words, of our place in the cosmos, how tiny and fragile we are in the vastness of space, how precious life and Earth are and how we need to get beyond our hubris and our delusions to save Earth and ourselves from becoming forgotten specks in the space-time continuum. The space between the termination shock region and the heliopause is known as the heliosheath.Īs the heliosphere plows through interstellar space, a bow shock forms, similar to what forms as a ship plowing through the ocean. This balance in pressure causes the solar wind to turn back and flow down the tail of the heliosphere. The boundary between the solar wind and interstellar wind is the heliopause, where the pressure of the two winds are in balance. The solar wind flows outward from the Sun for billions of kilometres, far beyond even the region of Pluto, until it encounters the termination shock, where its motion slows abruptly. The bubble presses outwards against interstellar plasma, which permeates our galaxy. This bubble is shaped like a long wind sock as it moves with the Sun through interstellar space. The heliosphere is the vast bubble-like region of space surrounding the Sun, created by the plasma (charged particles) "blown" out from the outer layers of the Sun, known as the solar wind.