Garrett Putman Serviss 
Curiosities of the Sky [PDF ebook] 
A Popular Presentation of the Great Riddles and Mysteries of Astronomy

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. As plain language will permit, showing the wonder that is in them without getting away from the facts. Most Of them have hitherto been discussed only in technical form, and in treatises that the general public seldom sees and never reads.