u/Ok-Confidence672

Seeing various youtube videos on the possibility of life on others planets, most show silly drawings of 3 eyed blue creatures per example, but if life needs to meet requirements similar to Earth, wouldnt alien life be similar? As in symetrical creatures, water creatures having fins, biped earthlings, winged birds, plants and crops etc?

Also, legit question, why is the Big Bang considered the start of everything if the universe is infinite? My trail of thought is imagining it being only a small part of it? To better examplify what i mean its like the Big Bang being a grenade thrown on Sahara Desert, seems empty, but a with a whole lot already there, far way