Except where otherwise noted, material on this site is copyright 2019–2021 A. P. Howell.
Cover artists and illustrators are the primary exceptions, and I do my best to highlight the creators’ names.
The header images in rotation are from NASA.
Celestial Fireworks, NASA Goddard 
Jupiter’s Moons, NASA/JHU-APL/Southwest Research Institute 
Frisbee Galaxy, NASA Goddard 
Omega Nebula (M17), MSFC 
Seyfert Galaxy NGC 1566, NASA Goddard 
Nebula NGC 5189, NASA Goddard
A. P. Howell 