dust
There are lots of them. Perhaps you mean neutrinos?
yes. it travels as photons which are individual quantum of light, caused by the electrons losing quanta of energy
Not at all. It relates to molecular and smaller particles science.
Not. Because. it can only possible when it travel with speed of light, but it is still impossible.
There are several pros and cons of space travel. Pros for space travel include scientific resserch. many common household items were developed because of space travel, among them, velcrow, memory...
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