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A comment on If the universe is 13.8B years old, how can we see 46B light years away? (2018). Parent comment

Re:If the universe is 13.8B years old, how can we see 46B li... by corrund on Saturday December 07, 2019 @02:04PM (#21731936)
Infinite amount of dark mathemagic is required for faster than light expansion of nothing.
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Re:If the universe is 13.8B years old, how can we see 46B li... by saagarjha on Saturday December 07, 2019 @04:07PM (#21732565)
Not really.
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Re:If the universe is 13.8B years old, how can we see 46B li... by troubler on Saturday December 07, 2019 @04:30PM (#21732685)
FTL speed requires infinite amount of energy in this iteration of physics, except for case when vacuum is not empty, but even in this case medium cannot move at supersonic speed of medium, while still in one piece. If far away vacuum moves at FTL speed, then there must be "sonic" barrier somewhere.
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Re:If the universe is 13.8B years old, how can we see 46B li... by saagarjha on Saturday December 07, 2019 @08:46PM (#21733885)
It's the fabric of spacetime that's expanding. Nothing physical is moving and thus no energy is necessary.
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