**Appropriate Level: **Algebra 2 (with logarithms)

**The Question:** Suppose you start with an object that has the mass of a proton. If this object doubles in mass every five minutes, how long will take for it to grow to the mass of the current universe?

Ask for guesses. Will it be a few hours? A few years? A few millenia? Much longer?

If you wish, give them the following estimates: Google says the mass of a proton is about kilograms. The wikipedia page on the “Observable Universe” says it has a mass of about kilograms.

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## About Aaron

I like good math problems.