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.
Spacewatch: The Titius-Bode Law. Nasa's Dawn probe has now left Vesta, its ion thrusters accelerating it gently towards the dwarf planet Ceres. It was back on the first day of the 19th century that Ceres became the first object to be discovered in what we now know as the asteroid belt between Mars and Jupiter.