can you create an atmosphere?

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https://www.google.com/search?q=terraforming+atmosphere&rlz=1C5CHFA_enUS750US750&oq=terraforming+the+atm&aqs=chrome.2.69i57j0l2.6294j0j7&sourceid=chrome&ie=UTF-8

Can you create an atmosphere?

All planets and large moons have enough gravity to hold an atmosphere, so terraforming in theory is widely possible. But in terms of human life not all gravities are created equal. On Mars you weigh 0.38 your weight on Earth, and we're not entirely sure what this would do to human health.Sep 8, 2014

Forget Mars. Here's Where We Should Build Our First Off-World ...

blogs.discovermagazine.com/crux/2014/09/08/where-build-off-world-colonies/