Cluster B disorders are marked by inappropriate, volatile emotionality and often unpredictable behavior. The disorders in Cluster B are antisocial personality disorder, borderline personality ...

Most North American observers will be able to watch as the moon passes in front of more than a few stars in this cluster (called an occultation) within a few hours, amid the dazzling lunar glare.

A body that has enough mass and gravity to resolve itself into a perfect sphere is a planet, or planetoid. But asteroids should also not be confused with meteors, or meteorites. A meteor is a ...