Unmanned Earth orbiting satellites and robotic exploratory spacecraft to the planets, comets, asteroids, and the sun. Sites pertaining to past, current, and future or proposed missions may be included in this category.- Category ID : 429429
Rossi X-Ray Timing Explorer is a Goddard mission which was launched on December 30th, 1995. RXTE is designed to facilitate the study of time variability in the emission of X-ray sources with moderate spectral resolution.
A European Space Agency astrometry satellite mission designed to determine the composition, formation and evolution of our Galaxy, and create a detailed 3D map of over a billion stars.