A Cornell University astronomer discusses teaching astronomy in schools and provides details on concepts such as the theorized black holes that may be apertures to distant galaxies and remote epochs. (Author/JA)

Several scientists comment on the consequences of discovering life on Mars and the possibility of eventually making contact with intelligent extraterrestrial beings. (MLH)

Traces the history of astronomy by analyzing the scientific literature of various time periods, reviewing prize-winning research, and noting the input from physics. Speculates on some accomplishments that may occur in the next 75 years. (GS)

Presents examples which illustrate the importance of space exploration in diverse aspects of scientific knowledge. Indicates that human beings are today not wise enough to anticipate the practical benefits of planetary studies. (CC)