Could gravitational lensing prove the universe to be older?

  1. This is only my second post and I am a novice. So please excuse me if this is a naive post.

    Gravitational lensing around galaxies shows more distant galaxies hidden behind them. We estimate the universe is 13.8billion years old because that's the limit we can observe into 'the past'.

    My question is this.

    What if we were to look at the furthest galaxies for gravitational lensing? As the light we are observing has already travelled to the point at which we are observing the lensing effect. Is it not possible to show the universe is in fact older and bigger?

    Is this a stupid question or a genuine possibility? Either way, an explanation would be appreciated
  2. jcsd
  3. Chronos

    Chronos 9,856
    Science Advisor
    Gold Member

    There is an observational limit to the universe called the surface of last scattering. EM radiation more distant/ancient was trapped in a plasma that occupied the entire observable universe. That plasma persisted until the universe cooled enough to become transparent. We know when that occurred [about 13.7 billion years ago] and will never see anything older than that in the EM spectrum.
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