A:
A Rare Astronomical Event: Transit of Venus - Webcast - A Rare Astronomical Event: Transit of Venus - A Webcast of a presentation at the Library of Congress by Sten Odenwald, PhD., NASA. [U.S. Library of Congress (LOC)]

Astrobiology: Life in Space - A Webcast of a presentation at the Library of Congress by Dr. Daniel (Danny) Glavin, Astrobiologist at NASA’s Goddard Space Flight Center. [U.S. Library of Congress (LOC)]

Astrogeology Research Program - Primary homepage for the Astrogeology Research Program with links to solar system, space missions, technology, data & information, research programs for geology, remote sensing, and ice & polar, hot topics, photo gallery, and Astro Kids [U.S. Department of the Interior (DOI), U.S. Geological Survey (USGS), Astrogeology Research Program]

Astronomy -- Selected Internet Resources - Selected Internet Resources -- Astronomy. Science Reference Services; Science Reference Section; Library of Congress [U.S. Library of Congress (LOC)]

F:
FusEdWeb Fusion Energy Education - A fusion energy educational website about our sun, other stars and galaxies, and inertial and magnetic confinement [U.S. Department of Energy (DOE), Princeton Plasma Physics Laboratory (PPPL)]

G:
Gamma Ray Large Area Telescope (GLAST) - Information on the high-energy gamma-ray observatory designed for making observations of celestial gamma-ray sources in the energy band extending from 10 MeV to more than 100 GeV [National Aeronautics and Space Administration (NASA)]

Goddard Space Flight Center - Sciences and Exploration Directorate - Enables space-based exploration of the Earth, the Solar System, and the Universe through scientific leadership and innovation. [National Aeronautics and Space Administration (NASA), Goddard Space Flight Center (GSFC)]

H:
High Altitude Observatory (HAO) - Focuses on the numerical simulation of convection, radiation transport, and large-scale dynamics in both the solar and terrestrial atmospheres, plus measurement of the Sun's output of magnetized plasma and radiation [U.S. National Science Foundation (NSF), National Center for Atmospheric Research (NCAR)]

N:
NTRS (NASA Technical Reports Server) - Search for reports, journal articles, and conference proceedings [National Aeronautics and Space Administration (NASA)]

O:
Optical Long Baseline Stellar Interferometry News - A forum for scientists, engineers, and students where you will find links to projects devoted to stellar interferometry, news items, and resources for further research [National Aeronautics and Space Administration (NASA), Jet Propulsion Laboratory (JPL)]

S:
Seasons of the Year - The reasons for the seasons; part of an educational web site on astronomy, mechanics, and space. [National Aeronautics and Space Administration (NASA)]

Solar Dynamics Observatory - Information to help us understand the Sun's influence on Earth and Near-Earth space [National Aeronautics and Space Administration (NASA)]

Solar System - Provides information on the planets, the Sun, asteroids and comets, solar system missions, and images and videos [National Aeronautics and Space Administration (NASA), Jet Propulsion Laboratory (JPL)]

Solar System Simulator - Creates a color image of a planet or its satellite [National Aeronautics and Space Administration (NASA), Jet Propulsion Laboratory (JPL)]

T:
The Sun-Earth Connection: Heliophysics - Information on the sun's interaction with the Earth and Solar System. [National Aeronautics and Space Administration (NASA)]

W:
Webcast: The Many Colors of the Sun - A Webcast of a presentation by W. Dean Pesnell of the NASA Solar Dynamics Observatory on new observations and views of solar phenomena. [U.S. Library of Congress (LOC)]

What is a blue moon? Is the moon ever really blue? - Everyday Mysteries: Fun Science Facts from the Library of Congress [U.S. Library of Congress (LOC)]