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This paper plate porthole provides the perfect opportunity for kids to "see what's under the sea". It's a good craft for an outer space theme.
If making a porthole: For the handle:
Glue cheerios around the outside of the plate as decorative “bolts”
Print out the template of choice.

Cosmonaut Sergei K. Krikalev, flight engineer for Expedition One, is positioned at a port hole on the Zvezda service module of the International Space Station.
Source: NASA International Space Station Imagery