This is a completely different subject, but proof of life on other planets? No. In fact, the more we learn, the more it appears as though planets like ours are not only very rare, but downright freakish. There are dozens if not hundreds of factors that all have to be exactly right. We could very well be the only one in the entire galaxy with life, at least above the microbial level.
“ This is a completely different subject, but proof of life on other planets?”
Perhaps you misspoke but I challenge you to find any responsible scientist claiming proof of life on another planet. It is, however, eminently reasonable to cite our own planet as proof that life exists on a planet. It is further reasonable to extrapolate that, however rare, life may exist on one or more other planet. Keep in mind how vast just our Galaxy is. If the sun were the size of a proton, the galaxy would be the size of the continental US. There are 200 billion galaxies at a minimum. There is an awfull lot of real estate out there.