Could we capture hydrogen from the solar wind instead of importing it or getting it from local sources ie water on mars or the lunar ice? Would it be worth the time vs energy used to get it?
Basically my thought is to Terraform someplace like Venus that is missing hydrogen and you were going to build a massive solar shade to cool the planet. Could you capture the hydrogen that would be hitting the shade. You could use the hydrogen to create any number of items (fuel, water, etc.) instead of importing it.