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)]

Gravity Recovery and Interior Laboratory (GRAIL) - The GRAIL's mission includes two spacecrafts with objectives to enable the science objective of mapping lunar gravity and using that information to increase understanding of the Moon's interior and thermal history. [National Aeronautics and Space Administration (NASA)]

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)]