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.
Of the thousands of new exoplanets identified in the past few years, none has been quite like this oneâbecause it's still forming. Astronomers led by Stephanie Sallum at the University of Arizona and Katherine Follette at Stanford University have discovered the first planet still in the process of formation. The hatching planet is nestled between a massive ring of dust and gas and a young 2-million-year-old star named LkCa 15. That star is roughly 450 light years away from Earth and is similar in size to our Sun. While scientists previously had discovered other immature star systems like LkCa 15, where infantile planets are hypothesized to be growing, Sallum and Follette are the first to directly observe such a planet.