The adventure begins -- Is there anyone out there? -- Water worlds -- The origins of life -- UFO spotting -- Conspiracy theories -- Little green men -- A hellish world -- The clouds of Venus -- A history of Mars -- Mars jars -- Viking raid -- Searching for Martians -- Humanity on Mars -- Ceres -- The frozen world of Europa -- The mysteries of Titan -- A trip to Enceladus -- Beyond Neptune -- The Arecibo message -- Listening to the stars -- Dear aliens... -- Alien technology -- Comet taxis -- Exosolar system -- Detecting exoplanets -- Space telescopes -- Next-door neighbor -- The TRAPPIST-1 system -- Interstellar travel -- Generation ships -- Are we being watched? -- Are we special? -- First contact -- The future.