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With all my enthusiasm for humanity's future in space, there's one glaring problem.
We're soft meat bags of mostly water, and those other stars are really really far away.
Carl Sagan lived in a working-class Jewish neighborhood and attended public schools in New York and New Jersey.
Carl Sagan became fascinated with science and the field of astronomy at a very young age.
As Einstein taught us, gravity isn't a force that pulls matter like magnetism, it's actually a warping of spacetime.
The Moon thinks it's just following a straight line through space, but it's actually following the warped path created by the Earth's gravity.From here, water, one of the keys to life, began to appear on the surface of earth.It took approximately one billion years for the first forms of life to exist on Earth.Over billions of years the planet we call home has been changing and growing more diverse with each modification.Geological changes allowed for new organisms to form whereas mutations and adaptations allowed for these organisms to become more diverse and even produce completely new life forms all together.We'll use that classic demonstration from the movie Interstellar, where you draw a line from two points, on a piece of paper and then fold the paper over and jab your pencil through to shorten the journey.That works great on paper, but is this actual physics?Even with the most optimistic spaceflight technologies we can imagine, we're never going to reach another star in a human lifetime.Reality tells us that even the most nearby stars are incomprehensibly far away, and would require vast amounts of energy or time to make the journey..pass_color_to_child_links a.u-inline.u-margin-left--xs.u-margin-right--sm.u-padding-left--xs.u-padding-right--xs.u-absolute.u-absolute--center.u-width--100.u-flex-align-self--center.u-flex-justify--between.u-serif-font-main--regular.js-wf-loaded .u-serif-font-main--regular.amp-page .u-serif-font-main--regular.u-border-radius--ellipse.u-hover-bg--black-transparent.web_page .u-hover-bg--black-transparent:hover. Content Header .feed_item_answer_user.js-wf-loaded .