also from our calculations of the age of the Sun I should add that science took its time getting to these large numbers for the age of the world the Mayan Long Count calendar includes cycles of NUMBER_TOKEN years Hindu tradition has a cyclic cosmology with nested epochs lasting millions of years in fact a single day of Brahma is NUMBER_TOKEN billion years oddly close to the age of the earth although it looks like we survived at least one day of Brahma and the last long count transitions so I'd say we're good for now so the picture has come together there's consistency in that NUMBER_TOKEN billion each year age across several independent measures that gives us some confidence in the results the confidence in the number may be justified but perhaps we've become a bit too comfortable with it these days we stare down at the unfathomable gulf of the past and shrug and we forget that the entire span of human civilisation is the width of a single hair on our heads compared to the stratified depths of the Grand Canyon not that our ancient earth cares it's revolved around the Sun NUMBER_TOKEN billion times through deep space and of deep time and it'll do the same again into what I guess you could call deep space time bring the comments from my apartment once again the New York Cove in nineteen locked down cannot be allowed to interfere with the important work of talking about black holes and last episode we went all the way through the black hole to talk about the speculative parallel universe on the other side your own speculations were impressive a few of you asked whether the Big Bang could be thought of as a white hole well the answer is that there are similarities but they're probably not the same first the similarities the Big Bang is a singularity it's the point of infinite density when you rewind the expansion of the universe so there's zero distance between all points in the universe from that infinitely dense point all of this energy and space expanded from the point and time flows away from that point the difference is that in the Big Bang the singularity was comprised of the entire universe there were infinite points at zero distance it encompassed all of space and so the Big Bang happened everywhere at once and it didn't expand into anything the white hole on the other hand would be an actual point within a larger universe and so it's expanding into something this is the stock response based on a standard mathematical description of the Big Bang but this probably also deserves a lot more depth and its own episode Clem Cao asks why some sources place the einstein-rosen bridge at the top of the Penrose diagram leading to a new white hole instead of to the side of the Penrose diagram as we saw in that episode well those diagrams that you're thinking of a Penrose diagrams of a rotating or a Kerr black hole the original einstein-rosen wormhole was for a non-rotating ausfahrt shield black hole in the Kerr black hole the central singularity is a ring and passing through the ring and back out appears to transport you to the interior of a white hole that ejects you into a separate region of space time that can be interpreted as a new universe and yeah you don't need superluminal speeds to do that now we'll also explore the detailed nature of wormholes and the interior of the Kerr black hole in their own episodes well I really get the best episode ideas from your comments a few of
START_SELFPROMO_TOKEN bring the comments from my apartment once again the New York Cove in nineteen locked down cannot be allowed to interfere with the important work of talking about black holes and last episode we went all the way through the black hole to talk about the speculative parallel universe on the other side your own speculations were impressive a few of you asked whether the Big Bang could be thought of as a white hole well the answer is that there are similarities but they're probably not the same first the similarities the Big Bang is a singularity it's the point of infinite density when you rewind the expansion of the universe so there's zero distance between all points in the universe from that infinitely dense point all of this energy and space expanded from the point and time flows away from that point the difference is that in the Big Bang the singularity was comprised of the entire universe there were infinite points at zero distance it encompassed all of space and so the Big Bang happened everywhere at once and it didn't expand into anything the white hole on the other hand would be an actual point within a larger universe and so it's expanding into something this is the stock response based on a standard mathematical description of the Big Bang but this probably also deserves a lot more depth and its own episode Clem Cao asks why some sources place the einstein-rosen bridge at the top of the Penrose diagram leading to a new white hole instead of to the side of the Penrose diagram as we saw in that episode well those diagrams that you're thinking of a Penrose diagrams of a rotating or a Kerr black hole the original einstein-rosen wormhole was for a non-rotating ausfahrt shield black hole in the Kerr black hole the central singularity is a ring and passing through the ring and back out appears to transport you to the interior of a white hole that ejects you into a separate region of space time that can be interpreted as a new universe and yeah you don't need superluminal speeds to do that now we'll also explore the detailed nature of wormholes and the interior of the Kerr black hole in their own episodes well I really get the best episode ideas from your comments a few of END_SELFPROMO_TOKEN