Very good popularizer Discovery / NatGeo, it is worth going to see his work. Exciting on certain points (UFO, exobiology, etc ..), a little less sharp on other (interstellar travel, ..) This book deserves a No. 2, which would deepen. I recommend this book reads easily, to any person who interresse to science without the need to be an expert. (Tantamount to Hubert Reeves) Do not pass up.
