Did scientists find a giant alien structure around KIC 8462852? Probably not, but if they did, what would these structures look like?nSuppor...
Did scientists find a giant alien structure around KIC 8462852? Probably not, but if they did, what would these structures look like?nSupport us at: http://www.patreon.com/universetodaynMore stories at: http://www.universetoday.com/nFollow us on Twitter: @universetodaynFollow us on Tumblr: http://universetoday.tumblr.com/nLike us on Facebook: https://www.facebook.com/universetodaynGoogle+ - https://plus.google.com/+universetoday/nInstagram - http://instagram.com/universetodaynnTeam: Fraser Cain - @fcainnJason Harmer - @jasoncharmernSusie Murph - @susiemmurphnBrian Koberlein - @briankoberleinnChad Weber - weber.chad@gmail.comnKevin Gill - @kevinmgillnnCreated by: Fraser Cain and Jason HarmernnEdited by: Chad WebernnMusic: Left Spine Down - “X-Ray”nhttps://www.youtube.com/watch?v=4tcoZNrSveE&feature=youtu.bennIn the summer of 2015, astronomers announced a strange new discovery from NASA’s planet hunting Kepler space observatory. Some object was blocking out about 22% of the light from its parent star: KIC 8462852. nnEven the largest planet in the Solar System, Jupiter, would only block out 1% of a star’s light, so something much larger must be doing this.nnBut what?nnAstronomers proposed a few ideas: a cloud of comets, or a maybe the debris from a recently destroyed planet. But another idea was put on the table: an alien megastructure.nnNow keep in mind, aliens are way down in the list of possibilities here. It’s almost certainly, for sure, probably not aliens. Seriously, every other possibility is a zillion times more likely than aliens. But there’s a remote, non-zero chance that it’s aliens, and their alien megastructures.nnAre you having trouble imagining what an alien megastructure might look like, and why it would exist? No problem, join the club.nnAll we’re doing is extrapolating from our current demand and growth for energy to its logical conclusion.nnImagine the future of humanity. We use more energy now than we did in the past. And in the future, we’ll want even more energy. Eventually we’ll use up all the energy on Earth, then we’ll figure out how to use up all the energy flowing out of the Sun. After that, we’ll use up all the energy in the entire Milky Way.nnFinally, we’ll use up all the energy within every single galaxy that we can get our hands on.nnAnd to do this, we’re going to want to build megastructures. Aliens will call them alien megastructures.nnSo what kind of megastructures will we build to extract all the energy from the Sun? n nImagine you encased the entire Sun in a rigid sphere; this the concept of a Dyson Sphere, first described by Freeman Dyson back in the 1960s. In fact, if you dismantled every single planet, moon, comet and asteroid in the Solar System, you could build a shell around the Sun about half a meter thick. nIt would have an interior living space of about 600 million times what we currently have on Earth. And if you set the whole sphere turning, the people at the equator would experience Earthlike gravity from the centripetal force pushing them outward. nnThis actually isn’t a great idea. You’d have to be pretty close to the equator to experience any gravity, and the forces on the whole sphere would try to tear it apart. There are no materials that we could imagine that could hold a structure like that together.nnA more realistic concept is a Dyson Swarm, where you build a single solar power collection satellite. And then use its energy to manufacture more of these things until there’s a cloud of them orbiting the Sun, and you’ve got your greedy hands on every single stray photon.nnSeen from afar, a cloud of these satellites would block the light from the Sun as they swept past, and make astronomers wonder if they’re seeing an alien megastructure.nnBut for a powerful alien civilization with the ability to dismantle a Solar System, this is just the first step. nnThe next megastructure is a Shkadov Thruster. This is a reflective half shell that’s put in place beside a star. Light pressure from the star pushes outward, holding the shell in place, and gravity from the shell pulls the star towards it. Over billions of years, a civilization could reorganize all the stars in their galaxy into a more useful configuration. nnAny galaxy that isn’t already moving away faster than the speed of light could be raw materials for a powerful civilization looking to get at every joule of energy.nn--------nSo what do you think is causing KIC 846852 to dim? Which theory do you like the best? Tell us your thoughts in the comments below.nnIn our next episode, we talk about planetary rings. Where do they come from, and what would Earth look like with rings of its own? Less
