dava, will you talk about this? >> he was identifying stars that were part of the nebula and percy found he thought he found a nova found it was a variable star and it was one of mr. levitz type of variable stars. with that he was able to tell the distance of the andromeda nebula and put it far out the milky way. that was the proof that the milky way was not the sum total of the universe. >> so by using levitz work, he expands the universe from a few hundred thousand light-years, suddenly, to millions and 90 billion light-years as far as the eye can see and possibly beyond. and that it's full of -- so this is andromeda and this is the relevance of the previous glass plate that they are capturing images of andromeda. this is really the moment of the huge discovery. the universe is huge, there are other galaxies and not only that but the galaxies are expanding and it relies on levitz work. >> it circles back to this idea that these women are able to create the data or information and they're not given time to do the r

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because dava feels this about is the way her husband grocery shops. >> he has no idea where anythinganything is. and so the phone calls begin. hi, honey. cutlets. chicken cutlets. cutlets! they're a type of chicken. chicken cutlets! >> my gosh he's going to bring her back a bra. that's what he's going to get. he's going to go to victoria's secret and buy her those plastic inserts that we call chicken cutlets. >> lord, i hope. >> and then you have to guide them step by step. walk back. keep walking. past the peanut butter. past the spices. >> it's like the opposite of the phone call when the mrs. goes to the hardware score. it's a phillips head screwdriver. if you get that one, it won't work. >> now pick a number. it's above the italian sausage. talk to you later. >> e the calls don't stop. >> hi honey. the eggs, they're right past the butcher on the left. >> hey, we can look at this from the bright side. she still has to do the shopping, but at least if she walks into the store, she can do it from home. >> don't get me started on the fruit. this is an actual photograph of a piece of

tonight booktv is in prime time with a look at nasa and space exploration, and we start with author dava sobel and her book, " the glass universe." and then from the tucson festival of books, ney that would ya holt discusses "rise of the rocket girls: the women who propelled us from missiles to the moon to mars." margot lee shetterly recalls a group of african-american women who played key roles in the devising of air rah naughtics -- arrow aeronautics. and astronomy professor chris empy talks about his book, "beyond." booktv in prime time tonight starting at eight eastern. >> the los angeles times has been putting on the festival of books for more than 20 years, and it has become an institution that's part of the community. and if, and it's a way that we can celebrate with the readers of the paper and with the city as a whole the very notion of reading. and today when the idea of there being something called fake news is out there, i think that books help us celebrate the way that words and facts are grounded in storytelling and in history. >> watch our live coverage of the los angeles