TED (Les. Eleven)

I have always wanted to know more about the Universe. And thanks to Sara Seager, I could do it. It is an interesting video, which will tell us about our Universe and the possibility of finding life on other planets

My questions are:
1. About what exoplanets does Sara say?
2. What is the difference 1-2 exoplanet(s) from our Earth?
3. What technologies are used to learn more about the Universe?