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.
Servicing Mission 4 is expected to extend Hubble's life into at least 2013. A rejuvenated telescope will continue to beam images of the heavens back to Earth, transferring about 120 gigabytes of data every week. Hubble's successor, the James Webb Space Telescope (JWST), is currently in the works.