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TIL in the early 1960s, the United States shot 480 000 000 copper needles into space
(en.wikipedia.org)
this post was submitted on 11 Feb 2026
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Today I Learned (TIL)
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What surprises me the most is that objects in medium earth orbit (no atmospheric drag) re-entered within 3 years, only from the pressure of the sun's radiation.
Yeah, that's what makes the concept of a solar sail so neat. Eventually hitting near light speed doing that.
The Sun is an angry laser
And with enough laser you can push
Yes, well, except for the "laser" part. And also the part about angry; one needn't anthropomorphize a natural phenomenon. The Sun is.
this response is the wurtzt