The universe we live in is empty mainly in terms of matter density. The protons and neutrons that constitute matter are called baryons, and approximately one proton exists in a space of 19.8 square meters. However, when the universe expands rapidly, the cosmic background radiation, known as a photon, is produced, resulting in two billion more photons in a grain of light. Since this light is a microwave, which has low energy and a long wavelength, it cannot be seen by the human eye. Therefore, humans, who only perceive visible light, consider the universe and the night sky to be dark. If there were aliens capable of seeing microwaves, the universe would be shining very brightly. The truth is that nothing has changed, but if the standards shift, it’s an entirely different story. - Joseph’s “just my thoughts”
In September 1999, NASA’s unmanned Mars climate probe “MCO” exploded in Mars’ orbit. Manufacturer Lockheed Martin set up the data unit as a “yard,” but NASA mistook it as a “meter.” The MCO entered the atmosphere of Mars 100 km below the original orbit and exploded in friction. Communication error had blown away $ 125 million. With this opportunity, NASA decided that the units used in space development were “meters”. A slip of the tongue in business doesn’t end just a mistake accidentally. It must undoubtedly damage the “cash flow”. - Joseph’s “just my thoughts”