 Among these, imaginary voyages to and explorations of Earth's Moon are found in seventeenth century literature.By the early twentieth century, following the increase in scientific and technological development spurred by the Industrial Revolution, fictional journeys to (or from) the Solar System's other planets had become common in fiction.Early literature regarding the Solar System, following scientific speculations dating back to the 17th century, assumed that every planet hosted its own native life forms—often assumed to be human in form, if not in attitudes.