The Atomic Spectra Database (ASD) contains data for radiative transitions and energy levels in atoms and atomic ions. Data are included for observed transitions of 99 elements and energy levels of 56 elements.

Archive of data products from NASA planetary missions, which is sponsored by NASA's Science Mission Directorate.

The SIMBAD astronomical database provides basic data, cross-identifications, bibliography and measurements for astronomical objects outside the solar system.

Published in 2003 and updated in 2008, these searchable tables cover physical, solvent, and thermodynamic properties of over 21,000 inorganic and organic compounds and pure substances.

Tables, constants, and other data from the National Institute of Standards and Technology.

Includes constants and property data important to physics and chemistry. Published in 1995.

Ready reference book of chemical and physical data, properties, and constants.

Published in 1954, these searchable tables cover a wide range of physical and chemical data and properties including thermodynamics, optics, nuclear physics, etc.

Published between 1924-1930, these searchable tables cover physical, thermodynamic, mechanical, and other important properties of inorganic and organic compounds and pure substances.

Use the Department of Energy Data Explorer (DDE) to find scientific research data - such as computer simulations, numeric data files, figures and plots, interactive maps, multimedia, and scientific images - generated in the course of DOE-sponsored research in various science disciplines.