You assume that our physical limitations apply on every inhabited planet in the universe ( IMO likely in the trillions ). The law of physics was invented by humans, so why should it apply to different intelligent species, which may not even resemble humans? Could be a cloud of electrified gas, or a mobile silicone like blob.
If an intelligent species ( one that doesn't kill each other and learned to live WITH nature ) has existed a million years longer than humans, is it not likely that they have learned more than we have?
You assume that intelligence is restricted to a physical form. We know that the power of thought is capable of many things, but if we could actually control it, perhaps pure intelligent energy without physical form could transcend physical limitations.
So many possibilities.