According to chartsbin, May is the month in which most countries around the world celebrate mothers day. To honour Mothers In Astronomy, Dr Paola Pinilla and Dr Maria Claudia Ramirez-Tannus came up with the idea of making the Mothers in Astronomy book to celebrate women who combine motherhood and astronomy. You can learn more about the project here, where you’ll also find the links to download the free book either as a PDF or an Ebook.