Administration: Individual. The DAB-4 is a revision of one of the most popular individual achievement tests available. Its 8 subtests identify studentsâ strengths and weaknesses across important areas of school achievement. A supplemental manual shows how to probe student responses to obtain information about studentsâ thinking processes and problem-solving strategies.
In 1992, the first evidence of a planetary system other than our own was discovered, orbiting the pulsar PSR B1257+12. Three years later, 51 Pegasi b, the first extrasolar planet around a Sunlike star, was discovered.
A New World: NASA Recalls Voyager 2 Probe's 1989 Neptune Encounter. NASA's Voyager 2 probe captured this image of Neptune five days before its historic flyby of the planet on Aug. 25, 1989. A quarter-century ago, the world got its first good look at the solar system's other blue planet. NASA's Voyager 2 spacecraft made the first-ever flyby of Neptune on Aug. 25, 1989, zipping by the ice giant and its frigid moon Triton in quick succession.