To planetary scientists, astronomers and astrophysicists, Earth is but one of several known worlds that host a substantial atmosphere and corresponding climate. By comparing these worlds, researchers can gain insights to their atmospheric compositions, current climatic states, and possible evolutionary histories. Through these comparisons, we have learned that warming by greenhouse gases can play a key role in determining a planet or moon’s average temperature at its surface.
Humankind has pondered the idea of life existing beyond our solar system for many generations. Recent discoveries of “earthlike” planets have re-energized these speculations. But what makes Earth perfect for life, and what does that mean for extraterrestrial life? Lucky Planet by David Waltham addresses these questions.