* Astronomy

Death-defying time crystal could outlast the universe

We don't have to take the heat death of the universe lying down - a time crystal, symmetrical in time rather than space, would have the power to survive.
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"It's not the most immediate problem in the world, but the point is, we don't have to take the heat death of the universe lying down. We can put up a pretty good fight for a very long time" - Nobel Laureate Frank Wilczek, MIT Centre for Theoretical Physics.

Many materials have crystalline ground states, wherein spatial translation symmetry is spontaneously broken. It is natural to ask whether there might be a corresponding phenomenon involving time translation symmetry.
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