Frontispiece -- Where the sky and Earth touch. Adapted from a woodcut by Camille Flammarion (19th century French astronomer). See Sky & Telescope, May 1977, pp. 356-57.

The Sun, our nearest star (April 18, 1996) -- Space Environment Center/NOAA/US Dept. of Commerce. http://www.sel.noaa.gov/current_images.html

Jupiter and two of its moons (by Voyager) -- NASA/Jet Propulsion Laboratory.
http://www2.jpl.nasa.gov/files/images/browse/p221083c.gif

Asteroid Gaspra (by NASA's Galileo spacecraft, October 1991)-- NASA/Jet Propulsion Laboratory.
http://www2.jpl.nasa.gov/files/images/browse/p40450c.gif

Comet Hyakutake (one-meter Schmidt Telescope, La Silla Observatory, Chile, March 14, 1996) -- Guido Pizarro, European Southern Observatory.
http://www.eso.org/epr/phot-23-96.html

Earth (by NASA's Galileo spacecraft, December 1990) -- NASA/Jet Propulsion Laboratory.
http://www2.jpl.nasa.gov/files/images/browse/037330.gif

The Sun in white light -- National Solar Observatory/Sacramento Peak, Sunspot, New Mexico.
http://www.Sunspot.noao.edu

X-ray image of the Sun (by the Yohkoh spacecraft, ISAS, Japan, May 8, 1992) -- Lockheed-Martin Solar and Astrophysics Laboratory/Yohkoh Public Outreach Program.
http://www.lmsal.com/SXT/html2/extended_corona_8_may_92_enhanced_red.html

Hydrogen bomb explosion ("Ivy Mike" test shot, Eniwetok Atoll, Pacific, November 1, 1952) -- US Department of Energy.
http://www.doe.gov

Betelgeuse -- A. Dupree (Harvard-Smithsonian CfA), R. Gilliland (STScI), NASA/Space Telescope Science Institute, and European Space Agency.
http://www.stsci.edu/pubinfo/gif/Btlgeuse.gif

Orion Nebula and enlarged view of its central region -- C. R. O'Dell/Rice University and NASA/Space Telescope Science Institute.
http://www.stsci.edu/pubinfo/jpeg/OrionFull.jpg

http://www.stsci.edu/pubinfo/jpeg/OrionProplyds.jpg

Supernova 1987A -- European Southern Observatory.
http://www.gsi.de/~demo/wunderland/deutsch/Abb.III.1.html