Astrophile: The Relativity-Testing Supernova Next Door | The New Enlightenment Age

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"Before anything else, we need a new age of Enlightenment."

- Friedrich Durrenmatt

We are all human; more specifically, we are all composed of the following elements:

Oxygen (65%) and hydrogen (10%) are predominantly found in water, which makes up about 60 percent of the body by weight. It's practically impossible to imagine life without water.

Carbon (18%) is synonymous with life. Its central role is due to the fact that it has four bonding sites that allow for the building of long, complex chains of molecules. Moreover, carbon bonds can be formed and broken with a modest amount of energy, allowing for the dynamic organic chemistry that goes on in our cells.

Nitrogen (3%) is found in many organic molecules, including the amino acids that make up proteins, and the nucleic acids that make up DNA.

Calcium (1.5%) is the most common mineral in the human body — nearly all of it found in bones and teeth. Ironically, calcium's most important role is in bodily functions, such as muscle contraction and protein regulation. In fact, the body will actually pull calcium from bones (causing problems like osteoporosis) if there's not enough of the element in a person's diet.

Phosphorus (1%) is found predominantly in bone but also in the molecule ATP, which provides energy in cells for driving chemical reactions.

Potassium (0.25%) is an important electrolyte (meaning it carries a charge in solution). It helps regulate the heartbeat and is vital for electrical signaling in nerves.

Sulfur (0.25%) is found in two amino acids that are important for giving proteins their shape.

Sodium (0.15%) is another electrolyte that is vital for electrical signaling in nerves. It also regulates the amount of water in the body.

Chlorine (0.15%) is usually found in the body as a negative ion, called chloride. This electrolyte is important for maintaining a normal balance of fluids.

Magnesium (0.05%) plays an important role in the structure of the skeleton and muscles. It also is necessary in more than 300 essential metabolic reactions.

Iron (0.006%) is a key element in the metabolism of almost all living organisms. It is also found in hemoglobin, which is the oxygen carrier in red blood cells. Half of women don't get enough iron in their diet.

Fluorine (0.0037%) is found in teeth and bones. Outside of preventing tooth decay, it does not appear to have any importance to bodily health.

Zinc (0.0032%) is an essential trace element for all forms of life. Several proteins contain structures called "zinc fingers" help to regulate genes. Zinc deficiency has been known to lead to dwarfism in developing countries.

Copper (0.0001%) is important as an electron donor in various biological reactions. Without enough copper, iron won't work properly in the body.

Iodine (0.000016%) is required for making of thyroid hormones, which regulate metabolic rate and other cellular functions. Iodine deficiency, which can lead to goiter and brain damage, is an important health problem throughout much of the world.

Selenium (0.000019%) is essential for certain enzymes, including several anti-oxidants. Unlike animals, plants do not appear to require selenium for survival, but they do absorb it, so there are several cases of selenium poisoning from eating plants grown in selenium-rich soils.

Chromium (0.0000024%) helps regulate sugar levels by interacting with insulin, but the exact mechanism is still not completely understood.

Manganese (0.000017%) is essential for certain enzymes, in particular those that protect mitochondria — the place where usable energy is generated inside cells — from dangerous oxidants.

Molybdenum (0.000013%) is essential to virtually all life forms. In humans, it is important for transforming sulfur into a usable form. In nitrogen-fixing bacteria, it is important for transforming nitrogen into a usable form.

Cobalt (0.0000021%) is contained in vitamin B12, which is important in protein formation and DNA regulation.

We all share a common birthplace, namely the crucibles of supernovae.

Disregard perceived differences. Let us learn to live together. Let us become enlightened!

Astrophile: The Relativity-Testing Supernova Next Door

Object type: Exploding star
Location: 160,000 light years from Earth, in the Large Magellanic Cloud

“Once in a lifetime” barely begins to describe it – astronomers had literally been waiting centuries for such a spectacle. The supernova that blazed forth on 23 February 1987 was the brightest since the one Johannes Kepler spotted in 1604.

The explosion happened just an astronomical stone’s throw away, in a satellite galaxy of the Milky Way, which is why it was so bright it could be seen with the naked eye. No supernova so nearby had been seen since the invention of the telescope.

“There was a lot of excitement,” recalls Roger Chevalier of the University of Virginia in Charlottesville. “People started to call each other up, saying ‘This is it!’”

But even before telescopes detected any brightening, experiments in Japan and the US were hit by neutrinos generated during the star’s death. In fact, SN 1987A remains the only supernova to explode close enough for its neutrinos to be detected on Earth.

So does the fact that the explosion’s neutrinos arrived faster than its light support the claim made last year that the subatomic particles might break the cosmic speed limit set by Einstein’s special theory of relativity? Surprisingly, no.

∞ Feb 24th, 2012 at 8:25 pm