It's a big question—is there alien life in outer space? Meet the astrobiologists searching the universe to see if there's anyone else out there! Dive into the stories behind astrobiology to explore. . . what scientists believe aliens might look like what makes a planet perfect for life the possibility that we've already been visited by aliens . . . and so much more! Scientists have been sending messages out into the universe, but nobody has returned their calls so far! The universe is much larger than the distance we can observe, so there is still much to discover. Beautifully bound with stunning illustrations, The Big Questions Answered is a unique, collectable series that will start a lifelong interest in science. QR codes link to the Big Questions Answered website for comprehensive, free teacher resources and downloadable fun extras for kids.