Its always amusing to see answers (length, speeds, masses) that are rediculously out of proportion. It can be faster than light, denser than neutron stars or heavier than the earth. Thats why its always good to get them to appreciate what difference a power of 10 makes.
There are some good websites and tools that help put large powers of 10 in physical perspective. This can be quite useful in teaching physical units, scientific form and plain old estimation.
Powers of 10 website with the original video
Interactive Java version (Much Smoother)
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