Learn what scientists mean when they describe a planet as "Goldilocks". Hover over the pink, blue and green dots to see some of the planets that researchers have discovered and where they fit in the Too Hot/Too Cold/Just Right spectrum.
Could human civilization eventually spread across the whole Milky Way galaxy? Could we move beyond Earth to establish colonies out among the stars? This video describes the conceptual von Neumann machine, a self-replicating machine that would be sent out into the universe.
What would it actually be like to live in a colony on Mars? This video "details the features of Mars that are remarkably similar to those of Earth — and those that can only be found on the red planet."