This was better than I thought it would be, and yet it went in a really different direction than I anticipated. The 80-year mission to explore an earthlike planet discovered orbiting the star Sirius C, some 8+ light years away, brings a team of scientists an unexpected discovery: the planet is just like Earth with "humans" inhabiting it. The group then is torn between all the wonderful discoveries that await with trusting the people they encounter. During this they discover that something has happened in the center of the galaxy that puts all life in their sector of the Milky Way in mortal danger. This is one of Bova's later works, but this guy can still spin a helluva story, albeit one here that requires just a little more suspension of disbelief than other Grand Tour novels. Worth a read, and definitely worthy to be in the Grand Tour storyline.