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The Instability

by Isaac Asimov

Professor Firebrenner explains to Atkins how they can go forward in time to study a red dwarf and then return back to Earth.
Of course, but how far can the Sun and Earth move in the few hours it will take us to observe the star?
DEBUT
“The Instability,” in The London Observer, 1 January 1989.
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1 English variant
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