The universe is expanding – but what is it expanding into?

The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts

Scientists and astronomers tell us that the universe is expanding. But what is it expanding into, ie what’s beyond the universe?
Phil Town, Lisbon

Post your answers (and new questions) below or send them to nq@theguardian.com. A selection will be published on Sunday.

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