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Importance Ratingsplugin-autotooltip__plain plugin-autotooltip_bigImportance ratings

In a departure from the usual Wiki format, Wikenigma assigns 'Importance Ratings' to some pages.

The idea is to separate articles which are considered (by the editors) to cover exceptionally important unknown issues from those which (although also u…

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• Jan 2021 : A milestone of 600 unknown articles has been reached.

• Oct 2020 : A milestone of 500 unknown articles has been reached.

• Aug 2020 : Currently (beta) testing the new 'WYSIWYG' (What You See Is What You Get

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Wikenigma - an Encyclopaedia of Unknowns Wikenigma - an Encyclopaedia of the Unknown Science

The Gravitational constant

The gravitational attraction between two objects is dependent on the mass of the objects, the distance between them, and the gravitational constant (G).

The masses and distance can vary, but the constant, as the name implies, is always a fixed number.

It was first measured in 1798 by Henry Cavendish, with an accuracy of around 1%. Since then, many more attempts have been made, using very different methods.

The margin of error for the results is not yet clear - the lowest measurement being around 6.66 ×10−11 m3⋅kg−1⋅s−2 and the highest 6.68, or in other words with a margin of error of around 0.3%

Although the error margin might seem small, it has extremely far-reaching consequences for calculations on cosmological scales regarding the beginning and the fate of the universe.

The constant is currently agreed to be an average value, with an accuracy of 0.1%

A further complication is that recent measurements (i.e. in the last 50 years or so) have tended to give values which appear to vary in a cyclic way. Giving rise to speculations that the constant may not in fact be constant. If it is eventually proven that the constant is varying, most of cosmological theory will have to be re-written. Note that many other investigators put the variations down to errors of measurements.

See Wikipedia

Also see Gravityplugin-autotooltip__plain plugin-autotooltip_bigGravity

Although three of the four (known) fundamental forces have been unified by one paradigm called the Standard Model, Gravity remains outside.

Like General Relativity, Gravity appears, so far, not to fit. This doesn't necessarily mean that Standard Model has fai…
and The Fine Structure Constantplugin-autotooltip__plain plugin-autotooltip_bigThe Fine Structure Constant

The Fine Structure Constant , identified by the Greek letter α is a number used in quantum physics calculations. The current estimate is that it's around 0.0072973525628 - or roughly 1/137.

It has been called the “
and Physical constantsplugin-autotooltip__plain plugin-autotooltip_bigPhysical constants

Many physics calculations rely on the assumption that the ‘physical constants’ e.g. light speed, gravity, etc etc are, in fact, constant. Extremely accurate experimental procedures strongly suggest that they (mostly) are. But the experiments can only…

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