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.
On June 25, 2011, Neptune arrived at the same location in space where it was discovered 165 years earlier. To commemorate the event, NASA's Hubble Space Telescope took anniversary pictures of the blue-green giant planet. Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA).ike all planets, Neptune orbits the sun in a stretched-out circle known as an ellipse. This means that its distance from the star is constantly changing. When the icy planet is closest to the sun, it lies only 2.77 billion miles (4.46 billion km).