Constants, Tables, and Data

Access a wide variety of astrophysics, space physics, solar physics, lunar and planetary data.

Explore the different databases to find what you're looking for.

A pdf version of the booklet, which was published in 2009.

The Particle Data Group (PDG) is an international collaboration that provides a comprehensive summary of Particle Physics and related areas of Cosmology: the Review of Particle Physics.

The NASA Exoplanet Archive collects and serves public data to support the search for and characterization of extra-solar planets (exoplanets) and their host stars. The data include published light curves, images, spectra and parameters, and time-series data from surveys that aim to discover transiting exoplanets.

NPL is the UK's National Measurement Institute, developing and maintaining the national primary measurement standards.

The United States Naval Observatory (USNO) provides a wide range of astronomical data and products, and serves as the official source of time for the U.S. Department of Defense and a standard of time for the entire United States.

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

Science.gov searches over 60 databases and over 2,200 scientific websites to provide users with access to more than 200 million pages of authoritative federal science information including research and development results.