Linked from

The 7 pages that link to Lookback time, each with the reason it gives.

• Luminosity distanceCompared with: It measures cosmic history in time, not the flux dilution of a source.

• Age of the universeCompared with: It measures how far into the past an observation reaches, not the universe's full age.

• Comoving and proper distancesCompared with: It measures a temporal interval, not the spatial separation between locations.