This is a more general question than How to get processed asteroid metals back to Earth in a safe manner

That question was actually a quick check to see if a particular idea was plausible. Instead, I would like to know what peer reviewed ideas exist for safely landing large masses on the Earth?

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    $\begingroup$ "safely" is relative; cost is overwhelming. $\endgroup$ – Carl Witthoft May 6 '20 at 11:55

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