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524apers said the Large Hadron Collider would create them on Earth when they turned it on back in 2008 (thankfully it did not!)</p> 525 526 527 528<p>It turns out âPlanet 5299â has been theorised since 1906, but back then Percival Lowell who was looking 530for it called it âPlanet Xâ. It is thought to have an elliptical orbit and at 531the furthest point of itâs orbit it is 13-26 times further away than Neptune is 532from the Sun. This planet, although never observed, would explain the strange orbits 533of minor planets in our solar system beyond Neptune, like Pluto, Eris, Makemake 534and Sedna. </p> 535 536 537 538<figure class="wp-block-image size-large"><img loading="lazy" width="950" height="596" src="http://www.curiousmeerkat.co.uk/wp-content/uploads/2020/01/PrimordialBlackHole_002-950x596.png" alt="" class="wp-image-4573" srcset="https://www.curiousmeerkat.co.uk/wp-content/uploads/2020/01/PrimordialBlackHole_002-950x596.png 950w, https://www.curiousmeerkat.co.uk/wp-content/uploads/2020/01/PrimordialBlackHole_002-300x188.png 300w, https://www.curiousmeerkat.co.uk/wp-content/uploads/2020/01/PrimordialBlackHole_002-768x482.png 768w, https://www.curiousmeerkat.co.uk/wp-content/uploads/2020/01/PrimordialBlackHole_002.png 1000w" sizes="(max-width: 950px) 100vw, 950px" /><figcaption><br> The orbit of hypothetical planet Nine shown with orbits of other trans-Neptunian objects. <a href="https://commons.wikimedia.org/wiki/File:Planet_Nine_Orbit.svg">Image</a> by MagentaGreen is in the public domain.</figcaption></figure> 539 540 541 542<p>As the âAstronomy Public 543Engagement Leaderâ at the University of Southampton, part of my role is to talk 544about my own research into Supermassive Black Holes, and talk about how we 545detect them by looking for the electromagnetic radiation that is detected from 546material near the edge of the black hole. Luckily, the idea of black holes and 547the weird goings-on near their event horizon really excites peoplesâ 548imagination. </p> 549 550 551 552<p>I love talking to people 553about black holes, but one of the most popular questions I get asked is âwhere 554is the nearest black hole to us?â and I always feel bad saying âWe donât knowâ. 555The problem is that as well as the supermassive sized black holes there are 556actually many smaller, stellar-sized black holes dotted about inside our 557galaxy, but unless they are ripping material from nearby stars they donât give 558off any radiation that we can detect, so we just donât know theyâre there.</p> 559 560 561 562<p>Despite being difficult to detect, we know that Black holes exist, it has been scientifically proven. Nothing else in Physics can describe what we observe. For example, there are 6 stars orbiting the centre of our very own Milky Way galaxy and you can see these with powerful telescopes such as the <a href="https://arxiv.org/abs/astro-ph/0502129">Keck Telescope</a><sup>2</sup>. However, the central object these stars are orbiting around cannot be detected; it is invisible. Astronomers can measure the speed of each of the stars and, using Newtonâs Laws of Universal Gravitation, they can calculate that this central, invisible mass, must be at least 4 million times more massive than the Sun. There is nothing in Physics that can be this massive and not emit any radiation, nothing except a black hole! So they simply must exist. </p> 563 564 565 566<p>The fact that there is a supermassive 567black hole that exists at the centres of all galaxies is quite an intuitive 568concept. You just need to look at a photo of our nearest neighbour galaxy – the 569Andromeda galaxy – or any other spiral galaxy that takes your fancy, and it is 570easy to imagine the billions of stars all swirling around the black hole at the 571centre. </p> 572 573 574 575<p>But – returning to our own solar system, and the theoretical planet 9 – what is a primordial black hole (PBH) and what would that look like? And how can there be one of these in our solar system that we have never detected? </p> 576 577 578 579<p> The word âprimordialâ means something that has existed since the beginning of time, therefore these âprimordial black holesâ, if they exist – they are still only a theory at the moment – have been around since the Big Bang, at the beginning of our Universe. </p> 580 581 582 583<figure class="wp-block-image size-large"><img loading="lazy" width="950" height="600" src="http://www.curiousmeerkat.co.uk/wp-content/uploads/2020/01/PrimordialBlackHole_001.jpg" alt="" class="wp-image-4574" srcset="https://www.curiousmeerkat.co.uk/wp-content/uploads/2020/01/PrimordialBlackHole_001.jpg 950w, https://www.curiousmeerkat.co.uk/wp-content/uploads/2020/01/PrimordialBlackHole_001-300x189.jpg 300w, https://www.curiousmeerkat.co.uk/wp-content/uploads/2020/01/PrimordialBlackHole_001-768x485.jpg 768w" sizes="(max-width: 950px) 100v
583w, 950px" /><figcaption>Artistâs Impression of Black Hole. <br><a href="https://www.esa.int/ESA_Multimedia/Images/2019/01/Artist_s_impression_of_black_hole">Image</a> by NASA/CXC/M. Weiss via ESA</figcaption></figure> 584 585 586 587<p>In order to create a black 588hole all you need is an area of space with such a high density of matter that 589it collapses in on itself. In the early Universe there were many regions where 590the density was higher and these black holes could have formed. Unlike stellar-sized 591black holes, primordial black holes are not thought to have been created by a 592collapsing star, because they are so old they predate the existence of stars 593themselves. </p> 594 595 596 597<p class="has-text-align-left">Stephen Hawking theorised that these primordial black holes could range from as small as 0.000000008 kg, the same mass as an eyelash, to several thousand times the mass of our Sun – as high as 1,000,000,000,000,000,000,000,000,000,000 (10<sup>30</sup>) kg. </p> 598 599 600 601<p>In the paper<sup>1</sup> that originally sparked my curiosity, they conclude that a primordial black hole that is 5 Earth masses (3 x 10<sup>25</sup>kg) could explain the anomalous orbits of the minor planets beyond the orbit of Neptune, and that this primordial black hole would have a diameter of 9cm. </p> 602 603 604 605<p>It turns out this PBH hypothesis is just one of the many possible explanations for what âPlanet 9â might be. Alternative ideas are that itâs just an extremely distant, massive planet that we are yet to directly observe, or that it doesnât exist at all, and the strange orbits of the minor planets beyond Neptune can be explained by a clump of icy rocks<sup>3</sup>. </p> 606 607 608 609<p>Whatever it is, the fact remains that astronomers have been trying to detect Planet 9 since 2014 when it was first hypothesised and they still havenât been able to detect it now (in 2020). As more time goes on with no direct observation of this illusive planet and no detection of any radiation from that region, the more likely it seems that there could indeed be an invisible, primordial black hole lurking in our very own Solar System. </p> 610 611 612 613<hr class="wp-block-separator"/> 614 615 616 617<h4>Want to know more?</h4> 618 619 620 621<ol><li>Scholtz, J., & Unwin, J. (2019). <a href="https://arxiv.org/pdf/1909.11090.pdf">What if Planet 9 is a Primordial Black Hole?</a>. <em>arXiv preprint arXiv:1909.11090</em>. </li><li>Eisenhauer, F., Genzel, R., Alexander, T., Abuter, R., Paumard, T., Ott, T., … & Bonnet, H. (2005). <a href="https://arxiv.org/abs/astro-ph/0502129">SINFONI in the galactic center: young stars and infrared flares in the central light-month</a>. <em>The Astrophysical Journal</em>, <em>628</em>(1), 246. </li><li>Sefilian, Antranik A., and Jihad R. Touma. “<a href="https://arxiv.org/pdf/1804.06859.pdf">Shepherding in a self-gravitating disk of trans-neptunian objects</a>.” <em>The Astronomical Journal</em> 157.2 (2019): 59.</li></ol> 622<style>img.birds_box_avatar {padding: 5px;background-color: #fff;border: 1px solid #ddd;}</style> 623 <div class="author_box_tabs"> 624 <nav> 625 <ul class="author_box_tabs_navigation"> 626 627 <li id="bio"><a data-content="bio" class="selected icon-ab-graduation-cap" href="#0"> Bio</a></li> 628 629 <li id="social"><a data-content="social" class="icon-ab-globe" href="#0"> Social</a></li> 630 631 <li id="lposts"><a data-content="lposts" class="icon-ab-paper-plane" href="#0"> Latest Posts</a></li> 632 633 </ul> <!-- author_box_tabs_navigation --> 634 </nav> 635 636 <ul class="author_box_tabs_content"> 637 <li data-content="bio" class="selected"> 638 <img alt="author's avatar" class="birds_box_avatar" src="http://www.curiousmeerkat.co.uk/wp-content/uploads/2020/02/sadieTenerife2016.jpg"> 639 <p><span class="by_text">By:</span> <span class="h4_text">Sadie Jones</span></p><p>Dr Sadie Jones is the Astronomy Public Engagement Leader and SEPnet Outreach Officer at the University of Southampton. 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