space-based radio astronomy
101Astrophysics — is the branch of astronomy that deals with the physics of the universe, including the physical properties (luminosity, density, temperature, and chemical composition) of celestial objects such as stars, galaxies, and the interstellar medium, as… …
102Hydrogen line — For hydrogen lines in general, see Hydrogen spectral series. The hydrogen line, 21 centimeter line or HI line refers to the electromagnetic radiation spectral line that is created by a change in the energy state of neutral hydrogen atoms. This… …
103Gravitational wave — In physics, a gravitational wave is a fluctuation in the curvature of spacetime which propagates as a wave, traveling outward from a moving object or system of objects. Gravitational radiation is the energy transported by these waves. Important… …
104Voyager program — This article is about the unmanned space probes of the 1970s. For other uses, see Voyager. The trajectories that enabled Voyager spacecraft to visit the outer planets and achieve velocity to escape our solar system The Voyager program is a U.S… …
105National Science Foundation — Motto: Supporting Education and Research across all the fields of Science, Mathematics and Technology America s Investment in the Future Where Discoveries Begin Agency overview Formed 10 May 1950 …
106MERLIN — For other uses, see Merlin (disambiguation). Multi Element Radio Linked Interferometer Network A map showing the locations of the antennas used in MERLIN Organization …
107Introduction to general relativity — General relativity (GR) is a theory of gravitation that was developed by Albert Einstein between 1907 and 1915. According to general relativity, the observed gravitational attraction between masses results from the warping of space and time by… …
108Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …
109PHYSICS — The material presented in this entry emphasizes those contributions which were important in arriving at verified present day scientific results, rather than those that may have appeared important at the time. Unavoidably it will overlap in parts… …
110Earth — This article is about the planet. For other uses, see Earth (disambiguation). Earth   …
