Astrophysicist Neil deGrasse Tyson is seemingly driven by an endless amount of curiosity. Whether it’s about the tiniest sea quark or the biggest black hole, he wants learn more. But that’s not enough. He not only wants to understand the science around us, he wants to make us understand too. In a recent YouTube clip from Tyson’s popular podcast StarTalk, Tyson gives a quick rundown of where “energy” goes when we die. With a chyron reading, “You don’t disappear. You transform. Some of you returns to Earth. Some of you travels the universe,” Tyson leans in and speaks directly to the camera. “In death, you’ve got pretty much two choices in modern society.” When we are buried He makes a case for being buried, as we see a traditional coffin being lowered into the ground. “You can be buried. That’s my choice, so that the energy content of my body—which is still there when you die—your molecules were built up from your lifetime of eating and exercise, and the building of your organs and your muscles and other tissue. In death, those molecules still contain energy.” The clip cuts to a graveyard as Tyson continues. “If I’m buried and I decompose, all that energy gets absorbed by microbes, by flora and fauna dining upon my body the way I have dined upon flora and fauna my whole life. And that way, giving back to the Earth.” When we are cremated We then see a fire moving in warm yellow, orange, and red tones. Tyson explains what happens during cremation. “If you’re cremated, the energy content of those molecules doesn’t go away. It gets transferred to heat that then radiates infrared energy that was once the molecules of your body. It radiates it out into space, moving at the speed of light.” He adds a most intriguing thought: that one could conceivably track that energy after cremation. “After somebody has been cremated, you can keep a timeline,” he says. A photo of an AI-generated video of a milky, gaseous star system swirling around a bright light is shown. Tyson continues, “Where has their radiant energy been by now? If they were cremated four years ago, they would have reached the nearest star system, Alpha Centauri. So that, in a way, you’re still a part of the universe, just in a different form.” View this post on Instagram A post shared by EXPLAIN EVERYTHINGS (@exploresciencedaily) What are our ashes made from? In his piece, “What Happens to Your Atoms After You Die?” chemical and mechanical engineer Arvin Ash gives a specific step-by-step rundown on happens to our atoms after we pass. In cremation, he explains, “What are these ashes composed of? Phosphate and calcium make up your bones, so that’s where these atoms come from. What happens to these ashes? These ashes are likely to make their way eventually to soil, where they will be incorporated into the structure of plants. These plants will be eaten by animals and humans, and end up back in your body. Eventually, tiny bits of you will end up in your great-grandchildren’s morning cereal or hamburger.” He, too, believes that some of our atoms will reach the farthest corners of the universe. “Your body also has a tiny amount of radioactive elements. Tiny amounts of thorium and uranium will eventually become lead. But along with this decay, some atoms of helium will also be formed. Earth’s gravity isn’t strong enough to hold helium to our planet, and so tiny bits of what once was you will float off into space. So some of your atoms are in for a fantastical and exciting journey, forever floating to the farthest reaches of the universe until the end of time.” On Facebook, this clip received over 3,000 comments, many from viewers who seemed fascinated by the cross-section of science and spirituality. “Green burial” Many had their own two cents to add. “Cremation, but then the ashes are used in a bios urn to plant a tree. You get a twofer… radiant energy from cremation to travel the universe, and then your ashes are used as nutrients for the tree,” says one commenter. Others note that even though the video clip showed a coffin, they believe Tyson was most likely referring to a “green burial.” After one commenter asked, “How does your ‘energy’ get out of that sealed coffin to feed flora and fauna?” another answers, “That is exactly the point—in a traditional sealed casket and concrete vault, it doesn’t… at first. It actually delays that natural cycle for decades. That’s why there is such a growing interest in green burials or human composting; they remove those barriers so our nutrients can actually rejoin the ecosystem and support new life immediately. Over a long enough time, the coffin will probably decay too. Most things do.” The post Neil deGrasse Tyson reveals the science of why he wants to be buried instead of cremated appeared first on Upworthy.