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Comments to #3
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Emailed 4 year s ago
Hmmm, if nr 2 would be true, then the space shuttle would not be needing the heatshield for re-entering the atmoshphere?
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Something 4 year s ago
... density is the word you looking for.
Solar sails really do work in space
In basic terms, when light particles hit a surface in space, they “slightly” push it and make it move in a direction. So, if a spacecraft is equipped with a reflective sail, it ‘should’ be able to move based on the light from the sun.
In July, a group called the Planetary Society announced that their solar-sail-propelled satellite, called the LightSail 2, reached a stable orbit around the planet, using only the power of the sun.
This means that sail-powered satellites can transport payloads through space forever and without fuel, making this a potential way for us to travel the stars.