But light exerts no force so it doesnt have a mass??
Read up on solar (light) sails for interplanatery travel. It does have a force, albeit small. A few kilometer diameter sail could have a spacecraft going the biggest part of the speed of light in a few years.
So your saying my flashlight does nothing but shoot out particles???
It makes sense that UTC time is used on antarctica, but why wasn't it used by astronauts on the moon......
Solar sailing is a method of converting light energy from the sun into a source of propulsion for spacecraft. In essence, a solar sail is a giant mirror that reflects sunlight in order to transfer the momentum from light particles (photons) to the object one is interested in propelling. Since the phrase "solar sails" is often confused with "solar cells", which is a technology for converting solar light into electrical energy, we will use the term "light sail" for the purpose of this discussion.
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