The sun continually blasts hydrogen in all
directions in the form of solar wind, which
could be collected. Otherwise it is very hard to
get the sun's material, due to the sun's immense
temperature and vastly more powerful gravity
than anything else in the solar system.
Hydrogen on Earth is easy to get: water
is two parts hydrogen and one part oxygen. Split
these up with electric current or ultraviolet
light and you get hydrogen gas - and oxygen gas.
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