ADHD is the most common problem seen in outpatient child and adolescent mental health settings. It is estimated that ADHD affects about 5% of children. Boys are diagnosed with ADHD about twice as much as girls. About 2.5% of adults have ADHD.
Report Abuse. The Milky Way, BY FAR! To give you an idea of size: Our sun, the next biggest celestial object on your list, is about 870,000 miles in diameter. The Milky Way's diameter is about 600,000, 000, 000,000 ,000 miles in diameter!Or in more practical terms: If the sun were the size of a large pin-head, the Milky Way would extend from the Earth to nearly twice the distance to the moon. screaming monk Â· 8 years ago.he Milky Way's diameter is about 600,000, 000, 000,000 ,000 miles in diameter! Or in more practical terms: If the sun were the size of a large pin-head, the Milky Way would extend from the Earth to nearly twice the distance to the moon. screaming monk Â· 8 years ago.
celestial equator. n. 1. (Astronomy) the great circle lying on the celestial sphere the plane of which is perpendicular to the line joining the north and south celestial poles. Also called: equinoctial or equinoctial circle.. celestial equator-the great circle on the celestial sphere midway between the celestial poles. equinoctial, equinoctial circle, equinoctial line. great circle-a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center.