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.
In the 1980s, Voyager 1 and Voyager 2 glimpsed the planet's ring system. In 2004, NASA's Cassini-Huygens mission became the first to enter orbit around Saturn, taking detailed observations not only of the planet but of its ring system.