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.
The fifth servicing mission to Hubble, HST-SM4, was originally scheduled to launch in late 2005 or early 2006. On 16 January 2004, then-NASA Administrator Sean O'Keefe canceled the mission, as well as any future missions to Hubble, citing safety constraints imposed by the Columbia Accident Investigation Board.