New Families
Some asteroid families have formed recently, in astronomical terms. The Karin Cluster apparently formed about 5.7 million years ago from a collision with a 33 km radius progenitor asteroid. The Veritas family formed about 8.3 million years ago; evidence includes interplanetary dust recovered from ocean sediment.
More recently, the Datura cluster appears to have formed about 450 thousand years ago from a collision with a main-belt asteroid. The age estimate is based on the probability of the members having their current orbits, rather than from any physical evidence. However, this cluster may have been a source for some zodiacal dust material. Other recent cluster formations, such as the Iannini cluster (circa 1–5 million years ago), may have provided additional sources of this asteroid dust.
Read more about this topic: Asteroid Belt, Families and Groups
Other articles related to "families":
... of thunderbirds in human form marrying into human families some families may trace their lineage to such an event ... Families of thunderbirds who kept to themselves but wore human form were said to have lived along the northern tip of Vancouver Island ... soon forgot the nature of one of these thunderbird families, and when one tribe tried to take them as slaves the thunderbirds put on their feather ...
... are reputedly controlled by the Buffalo Cosa Nostra family and at least three other families, including the Scranton, Colombo, and Genovese family which had and likely still have a local presence. 80s when the Buffalo Family was weakened after the death of Boss Stefano Magaddino and other families and influences jockeyed for power and influence, and ... to the Buffalo, Scranton, and Colombo families) ran the rackets, until they were decimated by federal indictments and convictions ...
... in particle physics offers an explanation of why there must exist three families of quarks and leptons ... The standard model thus offers no explanation of why there are three families, or indeed why there is more than one family ... as to destroy the perfect cancellation of the anomaly, per family, and to make the three families transform differently under an extended gauge group, and to arrange that the anomaly cancel, only for ...
... Archaeobatrachia - 4 families, 6 genera, 27 species Family Genera Common Names Example Species Example Photo Ascaphidae 1 Tailed frogs Tailed Frog (Ascaphus truei ...
Famous quotes containing the word families:
“We as a nation need to be reeducated about the necessary and sufficient conditions for making human beings human. We need to be reeducated not as parents—but as workers, neighbors, and friends; and as members of the organizations, committees, boards—and, especially, the informal networks that control our social institutions and thereby determine the conditions of life for our families and their children.”
—Urie Bronfenbrenner (b. 1917)
“Many older wealthy families have learned to instill a sense of public service in their offspring. But newly affluent middle-class parents have not acquired this skill. We are using our children as symbols of leisure-class standing without building in safeguards against an overweening sense of entitlement—a sense of entitlement that may incline some young people more toward the good life than toward the hard work that, for most of us, makes the good life possible.”
—David Elkind (20th century)