Hello, this is my first post on this forum. I independently study physics, physicists, and science in my spare time. I'm fascinated by it and can't get enough, although the more I learn.. instead of finding answers I just keep getting more questions. My questions aren't necessarily mathematical, but rather.. curiously. 1. I'm a huge fan of Michio Kaku, I sort of understand the string theory but was wondering if anyone on here believes in it, and can clarify what it is to me.. 2. How big is the actual Universe, and do you believe in multi Universes ? I kind of do believe in multi Universes, but I feel it's even bigger than that.. or smaller for that matter. 3. By physics, is time travel possible and if so how ? I've heard and seen documentary's that scientists are working on a portal but couldn't see how it's plausible. 4. What are your view's on extra terrestrial life, and if at all any exists in the cosmos .. Apart of me wants to believe in the 3 stages of human civilization purposed by Dr. Kaku, but another makes me wonder.. 5. I'm aware of how minuscule earth is, and was wondering if space travel is even possible in the future, and if theirs anything more faster than light.. maybe not yet discovered. 6. I know the Universe is dispersing, expanding at great rates .. but was curious if black holes have anything to do with it, and why black holes exist. Are they portals, and does the matter just evaporate after being distorted inside one ? My apologies if I posted this in the wrong place, I'm eager to know more about why things are the way they are.. and hear others views and theorys..