I want to thank the Simons Foundation for supporting all of our initiatives here where we do private events, events that are science themed or science inspired and its really with the support that we are able to using these events, were excited to shout at simon. I want to mention before i do this, our guest is an amateur astronomer, he will be out in the cold gardens, applaud a lot louder. Hes out in the cold garden tonight and helping us and the claim is that the cloud sphere, is right about exactly as we sent it in the last question and also we will have a book signing for the glass universe so we will have signing over here and we will do a little q a after our conversation so let me introduce our guest. Im sure a lot of you have heard of our guests so i want to introduce david sobel. David sobel is a bestselling author, a superb writer. I remember when i heard you speak about your longitude, you said i think it was her son, asked you what you are working on and he started, i didnt
Quite the tv is on twitter and facebook and we want to hear from you. To us at twitter. Com book tv or post a comment on our facebook page, they spoke. Com book tv. This is Henrietta Leavitt who was looking at a way to get to these magnificent images. Who was looking at images taken from south america because the whole sky had to be covered. There was an observatory built in peru to photograph stars of the Southern Hemisphere and she was looking at images of the Magellanic Clouds and she discovered 4000 variable stars and made a fundamental discovery about the pattern of variation that the stars that took the longest time to go through their cycles tended to be the brightest stars. And she figured all the stars she was looking at were roughly the same distance away so the ones that looked brighter really were brighter. And that observation led to the first usable yardstick for measuring what we would call now the lactic distances and intergalactic distances in space. And her work enabl
Director of the hayden planetarium, place we all went to as a kid and i was never the same after that. I came back and actually became director. We also want to welcome cspan into this event. They are recording it for book tv. Cspan inhouse. Pan is [applause] tonights book is called welcome to the universe. I love saying that, welcome to the universe. When you go to the planetarium director school, they teach you how to speak like that. Let me immediately introduce my coauthors. First, michael strauss. [applause] these are my two coauthors. [applause] have a seat so just a bit of an introduction, i talked fori t ten years at Princeton University from 1994 through 2003, and before i transferred all of my activities here to this museum, over that time, i taught a course on introductory astrophysics and i got very popular and people liked it and we moved to vickers pace and we realized we could charge, we could energize the course even more by adding other talent that has particular exper
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