 Greetings and welcome to the Introduction to Astronomy. The purpose of this video is just to serve as an introduction to the lecture videos that will follow. That will proceed through the OpenStax Astronomy textbook. So what we're going to see is that I have lecture slides and videos that I will be providing that are for use with the OpenStax Astronomy second edition book. Now these are an update to the slides that I've previously used and the lecture videos previously available on this channel. And those were the ones with the purple background. I've updated them to a different background to distinguish them. And I have also gone through and edited to update. Most of those were done in 2017 to 2018. So as you know there's been many changes in astronomy and I've tried to reflect that in the updated slides including some new discoveries and expanding on some areas that may not have been covered very well previously or may not even have been known previously. So they're an update to those and they will be out over the coming months. I am starting to release them now and will be releasing all 30 chapters of the textbook. Each chapter will have between two to five broken down into two to five sections. So there will be two to five lectures running hopefully in the range of about 10 to 15 minutes at the most. So that will be my goal for these and they will be done by summer of 2023 is my plan. I have the lecture slides currently completed and I'm beginning to work on the recordings now. So they will be coming you'll see some appear over the coming months and my goal is to have everything ready and in place for the fall semester. So I try to have them done as early in the summer as I can. But I expect later some of them may not be done until June or July. All the materials that I provide are released under a CCBY license meaning that you are free to use these as you wish and adapt them and or readjust them to fit your class. So if you're using them for another class and some of the things that I have don't quite work for the way you want to teach the class. You can go through and go ahead and edit the slides. I will provide a link to those in the description. Now as of recording this the slides are not fully done. There's a draft of them all and they will be in just in Apple Keynote format. Now I will once they are as they are completed I will be converting them as well into PowerPoint as well as PDF handout style slides that will also be available through the same Google Drive link. So feel free to use and adapt to these as you feel best to fit any class that you may be using. For students feel free to use these and print out the slides or get the slides in the format you prefer to be able to follow along with my lectures. So I will be putting that Google Drive link but again you won't be seeing a lot of the PowerPoint and other slides will not be available until later this summer as the videos are recorded and released. So that concludes this video on the introduction just introducing the lecture slides and videos that are coming. We'll be back again next time to begin our journey through the universe. So until then have a great day everyone and I will see you in class.