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.
The next year, astronomers found another small planet, also between the orbits of Mars and Jupiter, and named it Pallas. In 1804, yet another small planet, Juno, was discovered and then another, Vesta, three years later. By the middle of the nineteenth century, 15 of these minor planets had been located.