Meteorology. a line drawn on a weather map or chart that connects points at which the barometric pressure is the same. Also, isobare [ahy-suh-bair] /ËaÉª sÉËbÉÉr/ (Show IPA). Physics, Chemistry. one of two or more atoms having equal atomic weights but different atomic numbers.
Hubble Essentials. With the Hubble Space Telescope on board, Discovery begins its roll maneuver after liftoff from Kennedy Space Center on April 24, 1990. This low-angle view of the launch shows the shuttle atop the external tank, flanked by two solid rocket boosters, as it rises into the sky.
Hubble's second huge advantage is its ability to observe near-infrared and ultraviolet light, which is otherwise filtered away by the atmosphere before it can reach ground-based telescopes. Find out more about the spacecraft Hubble and see images of it in flight. Hubble has made many contributions to science since its launch in 1990. With 10 000 scientific papers attributed to it, Hubble is by some measures the most productive scientific instrument ever built. This section outlines the background to some of the key areas of research Hubble has contributed to.