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Hello Dirk I allow myself to make a correction in friendship. Sound in a vacuum does not propagate, the transmission medium is missing ( any existing gas, solid or liquid is the sound propagation medium). Different case is for the energy waves caused by the explosion of supernovae ( massive energy emissions) that also alter the gravitational fields of the planets that revolve around them. I remember that a nova is nothing more than the last blast of a sun that ends its nuclear fuel. It emits an amount of energy increasing its size, encompassing all the celestial bodies that are in its range. These are the massive amounts of energy that can cause changes in the position of nearby planets and/or stars. That these waves of energy are responsible for the continued expansion of the universe, I think is a theme that has not yet been answered. We don't have the technical means to investigate. It is true that the birth of the universe was called The "BIG BANG" theory. A greeting Max

Perhaps it will be that with microorganisms in recent times we are fighting and therefore I am not in my sympathies , but it would be enough to reverse the mechanism of destruction of forests so that we do not have to worry about the excessive production of carbon dioxide on the planet. In a spaceship some plants with low water consumption and carbon dioxide digesters also based on bacteria I would say that they could coexist. I like to imagine a tomorrow with green vegetation rather than with digester towers for the treatment of carbon dioxide.

The governments are all set to be extremely vigilant at the moment!  When it comes to an initial contact, everyone has to be fully prepared for it!  It would be good if more is shown in the public media, more reports etc. but let's be surprised what will happen Lg Thomas

Hello Dirk I completely agree with your vision. Think of that already today the damage that we have created the environment we come against; born gia children with microparticolati plastic part of their body and not to forget that the pandemic that we are experiencing is already the third down on humanity ( SARS, MERS, and SARS2 or COVID 19), whose genesis is from the research of the host species, and when the old host species is to decrease the chances of the survival of the virus; without forgetting the failures of globalization of the species, with their mixture. and the resulting environmental imbalances.

Hey Dirk! The heat given by electromagnetic waves is in relation to the frequency, that is, the oscillation of two periods one positive and the other negative: the more cycles follow each other closely ( lambda) and the higher the frequency rises (Hertz), the higher the energy of the waves. Taking a trivial example: up to frequencies of 10 to 8 we will have the frequencies that are needed for radio and TV transmissions with wavelength of lambda ≅300-0, 3 m. Frequency of 10 to 10, up to a frequency of 10 to 12, we will have the microwave ( the ones that we use to heat food in the microwave),lambda ≅300-0,3 mm.Frequency of 10 to 12 up to a frequency of 10 to 14, we will have the infrared ( already harmful to the epidermis) lambda ≅0.3 mm−700nm. From the frequency of 10 to 14 to the frequency of 10 to 17 we will find ultraviolet (they cause damage to the skin, but are also used to break down bacterial charges in controlled premises lambda 4 400−3nm. From the frequency of 10 to 17 to the frequency of 10 to 20 We Find X-rays, lambda 3 3-0. 003 nm.Beyond this frequency we find the gamma rays of the sun or other man-made Suns lambda <0.003 nm . This slew of frequencies that develop with proportionally shorter lengths (measured with the submultiples of the meter) together with the technical names by which they are known, give the idea of the energy and the effects that these produce. Electrons are small, but appropriately generated and excited...! Visible light and its color spectrum are at a frequency between ≅4.3 x10 at 14 and 7.5 x 10 at 14 Hz and a lambda wavelength of 7 700−400Nm . That said, creating electron "shields" to protect against heat is something that, perhaps, will be talked about when the scientific community, engaged in research, has eviscerated and mastered the last secret of physics. For the moment to protect ourselves from heat, in all its meanings we have passive insulating materials in polymers, or elements such as lead for the "heat" of X-rays and gamma rays. Thinking and proposing has brought us to today, confronting thinking and proposing will take us even further.

And that's what happens when science only tells civilians there's only radiative forms of energy. There is a cold, generative, condensive, gravitational form that moves 10^6 times faster than the supposed movement of light..which isn't movement but a polarization from source - therefore the real speed of radiative light isn't set but dependant on the polarized potential difference between EM and ME wave spectrums respectively.