Only a select few have experienced spaceflight first hand but a good book can show you t 0 through an astronauts eyes here are some great ones. During the recent total solar eclipse in the us i overlapped my hands using the gaps between my fingers to form pinholes just before the start of totality someone noticed that the shadows formed through this pinhole camera onto a whiteboard were so sharp that the individual hairs on my arms were visible. The big bang is a remarkable idea of course that says that based on the observations that the universe is expanding and cooling today it was hotter denser and physically smaller in the past. The two main functions of sensors are navigational and tactical navigational sensors are used by the astrogator to determine the spacecrafts current position vector and heading
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