Types of extra-solar planets

Briefly describe the conditions under which habitable zones and stable orbits might be possible in binary star systems. Q3: Briefly describe how the Doppler method and the transit method can detect extrasolar planets around distant stars. Summarize the key advantages and major limitations of each method. Q4: Briefly describe each of the following three types of extra-solar planets: (1) Eyeball planets, (2) Hot Jupiters, (3) Super Earths. Explain how these types of planets are different from Earth, and whether they could have life on them.