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.
As the Hubble telescope received upgrades to its instruments, astronomers repeated the experiment twice. In 2003 and 2004, scientists created the Hubble Ultra Deep Field, which in a million-second exposure revealed about 10,000 galaxies in a small spot in the constellation Fornax. In 2012, again using upgraded instruments, scientists used the telescope to look at a portion of the Ultra Deep Field. Even in this narrower field of view, astronomers were able to detect about 5,500 galaxies. Researchers dubbed this the eXtreme Deep Field.