Earth Worlds Are Easy, Life Not So Much -- Discovery News
Planets up to about four times the diameter of Earth form under a broader range of environmental conditions than gas giant planets, a new analysis of data from NASA’s planet-hunting Kepler space telescope shows.
Scientists looked at 152 stars hosting planets or suspected planets that are Neptune-sized or smaller. They found that small planets, unlike gas giants, don’t need metal-rich parent stars to form.
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My Comment: The only way to be sure is to go there .... but .... traveling great distances is not possible for mankind today.