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.
What was the first planet ever discovered? The simple answer is Earth. In reality out of the eight planets in our solar system, only two have been discovered, the rest are visible to the naked eye. So, with that in mind, Uranus was discovered by Sir William Herschel in 1781. The other planet was Neptune and was discovered by John Couch Adams in 1846. Pluto was discovered by Clyde Tombaugh in 1930 but in August 2006, under new definitions of a planet, Pluto was demoted to the status of a dwarf planet.