In antiquity, it was common to assume a cosmos consisting of "many worlds" inhabited by intelligent, non-human life-forms, but these "worlds" were mythological and not informed by the understanding of the solar system, or the understanding of the Sun as one among countless stars. An example would be the fourteen Loka (it's a name) of Hindu cosmology, or the Nine Worlds of Old Norse mythology, etc. The Sun and the Moon often appear as inhabited worlds in such contexts, or as vehicles (chariots or boats, etc.) driven by gods. The Japanese folk tale of The Tale of the Bamboo Cutter (10th century) is an example of a princess of the Moon people visiting Earth.
Or in most of the books, people had spaceships that allowed them to travel between different star systems, and on planets in these other systems, intelligent creatures lived that somewhat looked like people, but were different. If other creatures live on other planets, then they have to face the same type of problems, so it seems impossible for them to travel from their planets to ours. So, if there are intelligent creatures living on planets in other star systems, it seems, according to modern science, that we won't meet them.
But, are there planets with other living creatures in this universe? And if so, are there intelligent creatures on other planets? Some people are fascinated by the thought, and quite some effort is spent to try to see if such creatures are there. Several theories have been proposed about the possible basis of alien life from a biochemical, evolutionary or morphological viewpoint.
Finally, is there life on other planets in our solar system? Well, I guess, yes: probably on Mars, there now will be bacteria brought to the planet from Earth by one of the Mars- expeditions that were recently carried out.
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