Assume that the nearest galaxy to us is separated from us by \(10^{20}\) m. If we wait long enough, in \(t\) years we won't be able to see any other galaxy from ours. If this time is written as \(a \times 10^{n}\), where \(1 < a < 10\), what is the value of \(n\)?

**Details and Assumptions**:

- Take the Hubble constant \(H = 10^{-18}\) \(s^{-1}\)
- Assume the speed of light \(c = 3 \times 10^{8}\text{ m/s}\).

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