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.
We know of a number of planets outside our own solar system. The first one was discovered in 1995, and their numbers are approaching three hundred. Distances vary, and one (OGLE-2005-BLG-390Lb) is reported at 21,500 light years away.As you can imagine, they're very hard to see.In our solar system, we know of only the two dwarf planets beyond Neptune: Pluto and Eris. There may be more, but we don't know. The Kuiper belt begins at about the orbit of Neptune, and there is a lot of material in it to construct a planet.s you can imagine, they're very hard to see. In our solar system, we know of only the two dwarf planets beyond Neptune: Pluto and Eris. There may be more, but we don't know. The Kuiper belt begins at about the orbit of Neptune, and there is a lot of material in it to construct a planet.