Curiosity Corner: Why Haven't We Met Aliens Yet? A Kid's Guide to the Vast Universe

To the point

Space is so vast that contact with any aliens would be extremely hard; scientists like NASA look for planets with water, air, and suitable temperatures, but no evidence of aliens has been found yet; aliens could be very different, like tiny microbes or beings in extreme places, which makes detection and communication difficult; even intelligent life would require thousands of years to exchange messages, but the search continues with better technology and we might one day learn we are not alone.