Unless otherwise noted, material on this site is copyright A. P. Howell.
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
