So if we wanted to put a satellite in a circular orbit at 500 km above the surface (what scientists would call a Low Earth Orbit LEO), it would need a speed of ((6.67 x 10-11 * 6.0 x 1024)/(6900000))1/2 or 7615.77 m/s.o really, the question of How Satellites Stay in Orbit, is a multidisciplinary one that involves a great of technical and academic knowledge. Trade of US Satellites and their components will be eased by HR 3288.
It is estimated that about 40% of hydrocephalus cases have a possible genetic etiology [ 10 ]. In humans, X-linked hydrocephalus (HSAS1, OMIM) comprises approximately 5â15% of the congenital cases with a genetic cause [ 10, 17 â 20 ].
Many genetic conditions are associated with an abnormal pattern of head growth; the earlier these conditions are detected, the earlier appropriate treatment, services, and genetic counseling can be provided [5]. The etiology and evaluation of microcephaly in infants and children will be reviewed here. The etiology and evaluation of macrocephaly and the clinical genetics approach to microcephaly are discussed separately. (See Microcephaly: A clinical genetics approach and Macrocephaly in infants and children: Etiology and evaluation, section on 'Etiology'.) MONITORING HEAD GROWTH.