Thank you for the upload! After watching your video I understood the HR diagram so much more than from just looking at online websites.

Ola. I have completed almost all your videos and to say that they are useful is a real understatement. You have done a fantabulous job in helping students like me to get a clear picture of so many astronomy related concepts . Thanks a ton!!

Thanks for making these! I've lost my voice and I was looking for a video I trust to give an overview of what I wanted to say before the H-R diagram lecture tutorial tomorrow. Great clear explanations and inclusions of women and POC. Thanks for giving me something to show rather than me croaking into a microphone.

Usually i dont write comments on youtube videos, in fact this is one of my first comments ever, but i have to thank you for all your work and effort in making these videos, even if im a physics student i appreciate simple and clear explanations that help us remind concepts and link facts together. Thanks

You don't even know I thankful i am for having your video

Amazingly wonderful explanation!!

Thanks, very helpful. Wondering white dwarfs can be really so hot like a O or B - Type Star. What type would be a Neutron Star or do they come also in every temperature ? And what are the indications for Quasars in a spectrum or data ?

Good explanation, thanks. Question for my verification: If energy related to luminosity - more blue, more energy, higer frequnecy- why the REd giant BETELGEUSE wtih 3500K has more energy then SOn?