John Spacey

This book is very innovative in content and form.
For the content, it opens up the possibility of being able to make far-away travels into space and returning to our Earth and find people as we had left them: not aged, which is very innovative compared to what physics is saying in 2020.
Also for the form, this book describes in an original way, with questions, all the current problems to make a far-away travel into space.
There are not many pages to this book but you have to read it up to the end, and it will take time to fully analyze the remarks and questions, and it will be a very pleasant time for the readers.
Indeed, there is a little theory and especially numerical applications at the end of the book which explain well how to use the equations.
I find this book easy to read, despite the theoretical subject matter and without the presence of a story, as with traditional science-fiction books.
But for people interested in cosmology, astrophysics, and far-away travels into space, it is a very interesting source of thought.
I strongly recommend reading this book.