You are currently browsing the tag archive for the ‘core’ tag.

ss_59d66ff7c9e93eefb80b6753ce9937c007204078.1920x1080.jpg

In 2016 the Japanese Space Agency launched a quarter-of-a-billion dollar x-ray observatory named Hitomi into Earth orbit.  The craft’s mission was to study extremely energetic processes at the far reaches of the universe.  It was hoped that the data Hitomi provided would allow astronomers to understand how the large scale structures of the universe came into being (how galactic superclusters form, for example).  The satellite initially worked perfectly, but, within 38 Earth days, the spacecraft was lost: a failure of attitude control sent it into an uncontrolled spin which caused critical structural elements to break apart.

2cfb8b6a10b9d869efc4ee05cbd2dae0-768x543.jpg

The full story of what destroyed Hitomi is perhaps of greater immediate interest to living beings on Earth than how the meta-structures the universe came into being.  When everything went wrong for the ill-fated space observatory it was passing over the southern part of the Atlantic ocean.  For spacefarers, this region of the Van Allen Belt is analogous to what the Bermuda Triangle or the Namib Skeleton Coast is for sailors: it is a haunted and dangerous stretch of space.  Astronauts who travel through it report strange phantasmagorical dots and streaks in their vision, even when they close their eyes.   The Hubble Space Telescope does not make observations when it passes over the south Atlantic.  Controllers turn off its delicate systems.  The region is known to the world’s space agencies as “the South Atlantic Anomaly.”  Hitomi was not its first victim–it is surmised that the South Atlantic Anomaly was responsible for the failures of the Globalstar network satellites way back in aught seven.

aaebdb14079e8bc4abbbc48854b6283d.jpg

The existence of the South Atlantic Anomaly was known long before that.  It was discovered in 1958 by Explorer 1, the first American satellite (which was equipped with a Geiger counter).  Perhaps the Soviets would have discovered the anomaly by means of Sputnik, but, because the Cold War made  scientific cooperation difficult, Australia did not hand over Sputnik data to the Soviets until later.  Suffice to say, the South Atlantic Anomaly is an anomaly in the Van Allen Belt, the torus-shaped field of charged particles which are held in place by the magnetic field of Earth.  Earth’s magnetosphere is important. Billions of years ago, Mars and Venus seem to have been exceedingly Earthlike, with water oceans and convivial atmospheres.  But neither Mars nor Venus has a magnetosphere and their oceans have perished and their atmospheres have changed into monstrous things….although we don’t know exactly what happened on either of our neighboring planets (and the present priorities here on Earth are to make Michel Dell and Howard Schultz as rich as possible at everyone else’s expense, not, you know, to understand what planetary scale forces could make worlds uninhabitable).

56154e212f30d.png

Um, at any rate, the magnetic field of Earth is created by the mysterious processes beneath our feet at the center of the planet.  The Earth’s inner core is believed to have two layers: an outer core of molten iron and heavy metals and an inner core of solid iron nickel alloy.  The inner core is about 70% of the volume of the moon and it is nearly as hot as the surface of the sun with an estimated temperature of (5,430 °C) or 9806 °F, but the molten outer core is only as hot as the surface of an orange star (2,730–4,230 °C; 4,940–7,640 °F).  Within the outer core, eddy currents form in the superheated metal. The complex relationship between these currents, the spinning planet, and the two core layers creates a geodynamo which produces the planet’s magnetosphere which in turn captures the particles which make up the Van Allen Belts.  However, the eddy currents cause the magnetic poles to invert every few hundred thousand years (we are currently overdue for such a flip).  The South Atlantic Anomaly is a manifestation of the “weather” in the molten outer core of Earth–a prelude to the magnetic polar flip.  First generation spacecraft used solid state components and had big ungainly robust circuitry.  Additionally they were hardened against radiation.  Some of today’s craft make use of delicate & elaborate microcircuitry which is prone to failure when struck by esoteric radiation particles.  This is how what happens far beneath our feet influences what happens to craft in outer space.

16-psyche-in-comparisons

M-type asteroids are high albedo (i.e shiny) asteroids made partially or mostly of metal. Of all of M-type asteroids currently known in the solar system, 16 Psyche is the most massive.  It is a hunk of iron and nickel (and other heavy metals?) which has a diameter of 250 kilometers.  Psyche orbits the sun between Mars and Jupiter and is believed to be the exposed core of a planet approximately the size of Mars which was obliterated by a catastrophic impact.  The asteroid is named after the intrepid mortal who found love and ultimately apotheosis in an “Eyes Wide Shut” type Greek myth of great suspense, horror, and beauty.

The Rapture of Psyche.jpg

Are you curious to know more about 16 Psyche based on this description?  I certainly hope you are, because NASA has just announced future missions for the 2020s and 16 Psyche is on the list. As currently conceived, the Psyche exploration mission will send a robot probe powered by solar electric propulsion out to the obliterated core to examine the planetoid.  The probe will be equipped with a magnetometer and a gamma-ray spectrometer to find out more about the composition and history of the enigmatic relic.

psyche-h.jpg

Of course other long term aspects of the mission are of interest as well.  Although we have not yet mastered nuclear fusion, safe comprehensive control of such boundless energy is probably only 20 years or so away [winky icon].  What if humankind had sophisticated manufacturing robots and near infinite energy?  In such circumstances 8 million cubic kilometers of steel might come in very handy indeed.  So far the good news keeps rolling in for 2017.  This Psyche mission can’t happen fast enough for my taste.

torus_construction_ac75-1886_450

Ye Olde Ferrebeekeeper Archives

August 2019
M T W T F S S
« Jul    
 1234
567891011
12131415161718
19202122232425
262728293031