Bright Polar Caps and Blunt Cusps
The polar regions receive less light than any other portion of the planet.
So what is the cause of this exceptional brightness? Scientists currently
claim that aerosols high in the atmosphere of the polar regions are the
cause. Why should the Venusian poles be so extremely variable in brightness?
And why is this phenomenon so random?
Apart from becoming especially bright the polar regions an disappear
altogether. Instead of the polar regions (cusps) ending in a sharp point as
one sees on the Moon, they can become “blunted” and rounded. The tips then
disappear altogether. On 28th December 1789, 31st January 1790, and 25th
December 1791, J. H. Schroter noticed the blunting of the southern cusp. He
also saw detached points of light beyond the blunted cusps. The southern
cusp of Venus is blunt more often than the northern one. This might indicate
that a southern hole is larger than a northern one.
One interesting fact that Dr. Bartlett
noted is that often (35% of the time) the cusp caps appear at both poles at
the same time. This suggests a common link. Why would the weather at both
extremes of the planet produce aerosols at the same time? What is the
connection between the two? The one connection could of course be through
the centre of the planet. Could it be that a certain excitation of a central
Sun could cause air to flow out of Inner Venus and to then simultaneously
create bright polar caps at the same time?
Collars and Depressions
Perhaps the bright cusps are back-lit by light
from a central Sun? Perhaps this happen when the misty conditions inside the
planet clear up a little and more light manages to reach the upper polar
atmosphere? Perhaps the polar collar is also affected by winds blowing over
the edge of the hole as well? Such winds may raise dust and one might only
see this dust as it goes out over the rim of a hole.
Imagine the skin of the orange to be its “atmosphere.” The Earth is 7,926 miles in diameter. 99% of its atmosphere is contained in the first 30 miles of atmosphere. Now let us scale this down to an orange 70 mm in diameter. Its atmosphere would then be 0.26 mm thick. The Earth’s aurora occurs at tremendous heights where there is almost no atmosphere. The Earth’s aurora on such a little model would be about 0.42 mm above the surface of the orange. An orange has a rougher surface than a planet. The Reader should now appreciate how extremely thin a planet’s atmosphere is.
The Venusian atmosphere is not much thicker than the Earth’s. The planet’s atmosphere is akin to a thin “skin” covering the rocky surface. Any depressions in that skin could never be observed from the Earth. Telescopes do not have that sort of resolving power to see indentations so small. Nor could such depressions in the atmosphere dent or deform the planet’s shape in any way whatsoever. 30, 50 or 70 miles is utterly insignificant on a planet 7,700 miles in diameter. If such massive depressions exist, then it can only be because the underlying crust is itself deformed. Baum said that if the blunted cusp effect were real, it surely indicates a tremendous drop in the height of the polar vortex.
And yet, if one looks at those drawing one cannot help but doubt his reasoning. One is seeing something so enormous – something far greater than a mere 30 or 50 miles. One can only be seeing an enormous dent in the crust of the planet itself. In order to see something this enormous, and to have the effect which it does can only mean one thing: the surface of the planet has a dent in it hundreds of miles in depth. Such a dent would be the deepest crater or hole in the crust of any planet we know.
Astronomers have also seen streaks in the vicinity of the Venusian poles.
Since the polar collar lies at the same latitude and remains in the same
position, it might be the result of a physical feature. The Venusian
atmosphere possibly rises and falls, and hence this polar collar may become
more visible when the atmosphere falls in height. If winds blow into and out
of Venus, it may be possible that dust storms add to the collar’s darkening.
It is hard to determine whether the collar is the rim of a hole which we are
seeing directly, or whether it is caused by turbulence from air going into
and out of a hole. But either way, the polar collar does lead to the
suggestion that we are seeing a physical hole beneath the polar clouds.
What could possibly account for this? …light from inside Venus could have caused this phenomenon. Maedler saw the light pointing sunward. This is the opposite of what happens to a comet. A comet’s tail is directed away from the Sun by the solar wind. Clearly, this explanation will not work for what Maedler saw. His phenomenon could only have been caused if an Inner Sun was quite a distance off-centre in the direction away from the Sun. Light from an Inner Sun would then shine out through both Polar Holes at an angle, pointing towards the Sun.
The light would be refracted by the hot, dense
atmosphere, and there would be a fan pointing towards the Sun from both
Polar Holes. Why hasn’t this happened again? Why doesn’t this happen more
often? In order for us to see this light it must be reflected off something.
When the light is refracted, it might often appear to us as a large oval
spot when it is not centered on a pole. We might see the oval because the
light is being reflected by atmospheric particles. We would never see the
light out in space because there is nothing for it to reflect off.