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Robert's Answer
Robert Frost
Robert Frost, Trained NASA, ESA, JAXA, CSA, and RSA astronauts for the ISS
16.1k ViewsRobert is a Most Viewed Writer in NASA with 347 endorsements.
The same way they do on Earth.

Mechanical pencils and regular ball point pens work just fine in space.  So do felt-tip pens (markers).  There is no need for a pressurized space pen.

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Robert FrostRobert Frost 
Trained NASA, ESA, JAXA, CSA, and RSA astronauts for the ISS

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