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.
Service Mission 4 was completed in May of 2009, scientists replaced batteries, repaired borken instruments, installed new gyroscopes to maintain the telescope's stability, put in a new imaging camera, and a new spectrograph in hopes of keeping the Hubble in working order until 2014 when it will retire.