Page 51. " “When you look at a night sky studded with stars, most of them are orbited by unseen planets.” "

 This information surprised me a lot, as I always had the traditional belief of stars being suns shining on planets of their own. However, the truth is explained here with planets actually orbiting the stars that are not simply visible to us

Page 55. " “What do we really mean by Earth-like?” "

As David answers this in scientific terms such as having surface stable water and rigorous geological activity over billion years. However, I believe Earth is a centerpoint as to our knowledge, it is the only planet to exhibit human life till now. Thus, for any planet to be Earth-like should have the ability to support human life with adequate water, land and oxygen.

Page 55. " “Just because a planet is Earth size, does that mean it is Earth-like?” "

 In my opinion, having an Earth-like size does not make it much reliable to be ‘Earth-like’ as size is not the only deciding factor to be similar to Earth. A planet can be smaller and also inhabit life. But, many other characteristics do kick in such as climate and territories that contrast the topic concerning the capability of inhabiting life.

Page 57. " “What is life anyway? Would we know it if we found it?” "

This was an interesting question put up by David that made me ponder deeply. This is because it puts up the question that do we base ‘life’ upon terms that we live it by, or can life be within a creature made up with completely different biological terms and system and still be characterised as a source of ‘life’. I believe, it can.

Page 58. " “NASA hired James Lovelock, an iconoclastic, independent British scientist inventor” "

 Reading further about James's actions once hired by NASA, I wanted to learn more about his previous achievements. It came to my knowledge that James is an environmentalist that established the GAIA theory, a theory regarding how living organisms interact with surroundings and self regulate to maintain conditions for life on the planet.

Page 65. " “It is remarkable how many astrobiologists today remember Lynn as an essential mentor”. (pg:65) "

This statement lured me to learn about Lynn Margulis. She is a scientist author, educator, biologist, theorist and a popularizer mostly known for her contribution in the significance of symbiosis regarding evolution.

Page 68. " “So why even ask if Earth is an organism” "

I simply wanted to answer this question in concern to my beliefs and it made me question one mere thought, if Earth inhabits ALL of the living organisms, can it be simply also not regarded as an organism.