When people speculate about what alien life forms might look like, most experts think it is extremely unlikely that they will be anything like humans. Neil deGrasse Tyson has critiqued Star Trek for its “lack of imagination” by making all their alien species somewhat humanoid in form with only slight cosmetic differences (although that was probably more due to lack of finances rather than lack of imagination). Regardless, I think experts like NDT are wrong. Intelligent aliens, if they exist, will probably look somewhat similar to humans, as Star Trek portrayed.