Mars Can Wait. Questions Surround Settlements on Other Worlds

REVIEW: Documentary 'Good Night Oppy' brings science to life in

Space colonization - Wikipedia

The 22nd Century at First Light - the denning institute

How many people would it take to settle Mars?

4 big questions about the race to Mars

What it Takes to Build a Martian Colony

Mars Can Wait. Questions Surround Settlements on Other Worlds

For the Love of Mars — The New Atlantis

90 questions with answers in COSMOS