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Without a doubt, ufology and the search for extraterrestrial intelligences and clues are among the most fascinating concepts in the process of human understanding. It probably began in unknown times, when early humans were unexpectedly "confronted" with aliens and UFOs. This is evidenced, for example, by petroglyphs and figures that presumably depict such encounters or what they saw. Pre-astronautics, which we will come to later, even assumes that extraterrestrial intelligences visited Earth in the prehistory of humanity and significantly influenced human civilization. Ancient myths and legends of gods were also studied for this purpose.Similar theories assume that there are still remnants and survivors of an ancient "super-civilization" that, after a massive "war of the gods or a global catastrophe," could exist in very remote areas or even in underground bases/worlds on Earth, on the Moon, Mars, and hidden in Antarctica. Then theres the hypothesis that UFOs could also originate from other dimensions (time travel) or parallel worlds. Do portals belong to this category?With the advent of manned space travel and the advent of television, interest in possible intelligent extraterrestrials flying through space with their spaceships and advanced technology, and even visiting Earth, rapidly grew worldwide. The fact that there are extraterrestrials with good or evil intentions is part of the creation of every single science fiction story. There are already tens of thousands of books and science fiction novels worldwide, as well as treatises and discussions, all dealing with ufology and extraterrestrials.Read here how I got into ufology and my conclusion.

Segundo o dicionário Houaiss, massa crítica é expressão com dupla acepção: em Física, é a menor massa de um material físsil capaz de manter uma reação nuclear em cadeia; nas Humanidades, é a concentr

The universe was supposed to be all there was - the whole of existence. For centuries the size of the universe and whether or not it is finite, fascinated scientists and philosophers.But however big the universe may be, there being only one gave astronomers and cosmologists a headache. Existence as we know it is contingent on so many constants in nature which, if altered only slightly, would make life impossible. This seems so unlikely to happen by chance. What if, instead, there is in fact a vast range of different universes, with many variants of the universal contents, making ours just one of many that happens to be viable for life?In this illuminating exploration, Brian Clegg delves into the endless possibilities of the multiverse. Investigating questions of expanding, parallel and communicating universes, this accessible guide takes the reader into one of the weirdest and most exciting areas of modern physics and cosmology.