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That doesn't really help if it isn't abundant where it's needed. There's no primordial helium on Earth, all of it is created by alpha decay of radioactive eleme
by Sharlin 7y ago
That doesn't really help if it isn't abundant where it's needed. There's no primordial helium on Earth, all of it is created by alpha decay of radioactive elements. As to the rest of the solar system, all that abundant helium is locked in the bottom of particularly deep gravity wells.
- ShorsHammer 7y agoThere's a huge amount on our only moon.
- Sharlin 7y agoA few parts per billion, about one gram of helium-3 per 150 tons of regolith. For comparison, economical gold mining on Earth typically requires a deposit of at least 500 ppb or so. And there are no 3He "deposits" on the moon; it's all fairly uniformly distributed across the 38 million square kilometers of lunar surface!