Mon 1 Oct, 2012 06:41 am
I watched a H2 TV show last night that contained a planet described as a "tenth planet" in an early NASA press release, Eris (provisional designation: 2003 UB313) is now classified as a dwarf planet. Physicists are trying to learn if a dwarf planet they've named the Nemesis Star may be expected to strike Earth sometimes during 28 million years. They worry that the star may hit Earth sooner than feared.
Is this nonsense? BBB
Believers in Planet X/Nibiru have often confused it with Nemesis, a hypothetical star first proposed by physicist Richard A. Muller. In 1984, Muller postulated that mass extinctions were not random, but appeared to occur in the fossil record with a loose periodicity that ranged from 26–34 million years. He attributed this supposed pattern to a heretofore undetected companion to the Sun, either a dim red dwarf or a brown dwarf, lying in an elliptical, 26-million-year orbit. This object, which he named Nemesis, would, once every 26 million years, pass through the Oort cloud, the shell of over a trillion icy objects believed to be the source of long-period comets that orbit at thousands of times Pluto's distance from the Sun. Nemesis's gravity would then disturb the comets' orbits and send them into the inner Solar System, causing the Earth to be bombarded. However, to date no direct evidence of Nemesis has been found. Though the idea of Nemesis appears similar to the Nibiru collision, they are, in fact, very different, as Nemesis, if it existed, would have an orbital period thousands of times longer, and would never come near Earth itself.
Sedna or Eris
Still others csometime during onfuse Nibiru with Sedna or Eris, trans-Neptunian objects discovered by Mike Brown in 2003 and 2005 respectively. However, despite having been described as a "tenth planet" in an early NASA press release, Eris (provisional designation: 2003 UB313) is now classified as a dwarf planet. Only slightly more massive than Pluto, Eris has a well-determined orbit that never takes it closer than 5.5 billion km from the Earth. Sedna is slightly smaller than Pluto, and never comes closer to Earth than 11.4 billion km. Mike Brown believes the confusion results from both the real Eris and the imaginary Nibiru having extremely elliptical orbits.
SEASON 6 of the pioneering series THE UNIVERSE takes viewers further than ever, to the extreme edges of our solar system where chaos and catastrophe bring epic drama to the planets including some of the most horrifying days on Earth. Through stunning CGI, witness the birth pangs of the solar system, shocked into existence by a nearby supernova, and enduring over 700 million years of brutal bombardment by deadly asteroids; colossal cataclysms that shaped the planets and transformed their climates forever; and startling new scientific discoveries revealing a hellish history of continuous devastation on Earth. And travel to the system's very fringes to explore the possibility that the Sun has an evil twin, a monstrous star known as Nemesis suspected of causing every mass extinction in Earth s history. In signature cutting-edge style, THE UNIVERSE features astounding NASA footage and the opinions of leading astrophysicists to probe even more deeply into the billion-years-old story of the world beyond Earth.
DISC 1: Catastrophes that Changed the Planets / Nemesis: The Sun s Evil Twin / How the Solar System Was Made / Crash Landing on Mars
2012 October 1
Introducing Comet ISON
Image Credit & Copyright: Ligustri Rolando
Explanation: Could this dim spot brighten into one of the brightest comets ever? It's possible. Alternatively, the comet could break up when it gets closer to the Sun, or brighten much more modestly. Sky enthusiasts the world over are all abuzz, though, from the more optimistic speculations -- that the newly discovered C/2012 S1 (ISON) could develop a spectacular tail or briefly approach the brightness of the full Moon toward the end of 2013. Comet ISON currently is very faint but is just visible at magnitude 18 in the above image.
The comet, discovered just over a week ago from Russia by Vitali Nevski (Belarus) and Artyom Novichonok (Russia), is currently falling toward the Sun from between the orbits of Jupiter and Saturn. In early 2013 October it will pass very near Mars and possibly be visible to rovers and orbiting spacecraft. Comet ISON appears on course to achieve sungrazer status as it passes within a solar diameter of Sun's surface in late 2013 November. Whatever survives will then pass nearest the Earth in late 2013 December. Astronomers around the world will be tracking this large dirty snowball closely to better understand its nature and how it might evolve during the next 15 months.
The evidence indicates that our system survived a series of calamities within the last 100K or so years and ending around the time of the Trojan war, but that it is highly stable now with no real threats on the horizon.
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