I've read that solar wind consists of hydrogen atoms that are, near the Earth, travelling at about 450 km/s. This is only 3/4 of the Sun's escape velocity, but then the Earth is also 150 million km away from the Sun.

Does this mean that all those particles will eventually fall back down like a ball launched from a catapult? Even if said ball was launched at say 9 km/s, it's still less than the 11.2 required to escape so it'll eventually fall back down.