Issues

Binary pulsars, pulsars with millisecond periods and pulsars in globular clusters are distinguished by their evolutionary histories, and are providing tools for fundamental tests of physics.

Global‐scale disturbances in the stratosphere produce substantial changes in the abundance and distribution of ozone and prevent the formation over the North Pole of an ozone hole like that observed over Antarctica.

Women measured plates and reduced data in the great factory observatories, helping raise American astronomy to world‐class status while they themselves were relegated to second‐class status.