Is the universe fine-tuned? In other words, were physical laws and constants of nature somehow chosen to allow complex life to arise?
Are we alone? Might Earth be the sole exception in an otherwise dead universe? We shouldn’t be. The ingredients of life are everywhere — life should be common. But then, where is everyone?
How big is the universe? While it is generally known that the universe is very big, the latest science reveals that its true size defies all comprehension.