Skip Nav Destination
Issues
September 1971
ISSN 0031-9228
EISSN 1945-0699
Letters
Search and Discovery
Articles
A resolution of the clock paradox
Physics Today 24 (9), 23–29 (1971);
https://doi.org/10.1063/1.3022927
It's no paradox at all, claims our author, to an observer who keeps in mind the meaning of space and time in relativity theory.
How accurately can temperature be measured?
Physics Today 24 (9), 32–40 (1971);
https://doi.org/10.1063/1.3022928
The accuracy attainable outside the standards lab is at best only moderate, even with the most careful work and frequent recalibrations.
The Gum Nebula—A new kind of astronomical object
Physics Today 24 (9), 42–47 (1971);
https://doi.org/10.1063/1.3022929
Did radiation from a supernova explosion ionize this huge mass of hydrogen? Four theories propose ways that the Nebula could have been created by energy from the supernova.
Books
Excitation Mechanisms of the Nucleus, Nuclear Theory Series, Vol. 2
Physics Today 24 (9), 51–54 (1971);
https://doi.org/10.1063/1.3022934
Relativity and the Question of Discretization in Astronomy
Physics Today 24 (9), 54–55 (1971);
https://doi.org/10.1063/1.3022935
Radio Astrophysics: Nonthermal Processes in Galactic and Extragalactic Sources
Physics Today 24 (9), 57–58 (1971);
https://doi.org/10.1063/1.3022939
