What does need the launch price of 1 kg to be to make it economically feasible to destroy radioactive debris in the Sun as opposed to keeping it in safety on Earth for millions of years?

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    $\begingroup$ There are many details missing in this question. 1. What would you consider "secure for millions of years"? The millions of years part makes this nigh-on-impossible to define. 2. Why do you need to drop it into the sun? Is it not enough to crash it into Venus, which requires much less energy? 3. How secure does the launch and orbital manuveuring have to be? (You probably don't want the debris to fall from the sky, but there is never 100% certainty.) $\endgroup$
    – Giskard
    Oct 13 at 4:24
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    $\begingroup$ I think from the above you can see that there are a lot of moving elements here, making a definitive answer unlikely. You might have more luck asking about the physics (secure storage of certain radioactive elements.) or space travel (launch energy required, secure trajectories) aspects of the questions on the respective SE forums. $\endgroup$
    – Giskard
    Oct 13 at 4:27
  • $\begingroup$ Even a launch price of zero wouldn't make this economically feasible I suppose... If such a rocket explodes, the nuclear waste would basically contaminate the whole planet. $\endgroup$ Oct 13 at 8:49
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    $\begingroup$ Launch now and keep on Earth for millions of years are not the only possibilities. At any time the immediate choice is between launch and keep on Earth, but keep on Earth does not necessarily mean keep on Earth for ever. It also keeps open the possibility of launching at a later date by which time the available technology for doing so may be much better (cheaper, safer). In other words there is a kind of option value in a choice to keep on Earth which should be taken into account along with other considerations. $\endgroup$ Oct 13 at 12:13