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8. Once you've determined the overlap, add strips of masking tape to the part of the mailing tube that goes inside the toilet paper tube, so that it fits snugly. Congratulations, you've built a telescope! Still, do not look at the Sun!

8. Once you’ve determined the overlap, add strips of masking tape to the part of the mailing tube that goes inside the toilet paper tube, so that it fits snugly. Congratulations, you’ve built a telescope! Still, do not look at the Sun!