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A comment on One quantum transition makes light at 21 cm. Parent comment

Re:One quantum transition makes light at 21 cm by rwmj on Thursday April 24, 2025 @01:38PM (#43785359)
On the other hand, since it's a property of the universe maybe now's the time to define 21 cm as this value.
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Re:One quantum transition makes light at 21 cm by xnickb on Thursday April 24, 2025 @01:58PM (#43785586)
then cm will become a bit longer and it'll break many things
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Re:One quantum transition makes light at 21 cm by ncoco on Thursday April 24, 2025 @04:02PM (#43786914)
Like the width of an A4 sheet of paper.
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