1. Radial velocity, astrometry, transit method, and optical detection.
2. Astrometry, because they can measure how and where a star moves and take it away from the total mass.
3. The Goldilocks Zone is an area of space in which a planet is just the right distance from its home star so that its surface is neither too hot nor too cold. This means the could host liquid water.
4. The life would be different than ours because they're immune to different things, so what's is most common on that planet is what they are going to be use to. I think they are going to be smaller than humans, uglier, and more advanced than humans. They will be smart, because if they do exist, they kept their lives secret.
5.Yes, I believe in them and if they do exist they are a whole lot smarter than humans. I think they just haven't shown theirselves to humans yet because they know we will want to try to know more and more about them.
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