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.
Of all known stars, the VY Canis Majoris is the largest. This red Hypergiant star, found in the constellation Canis Major, is estimated to have a radius at least 1,800 that of the Sunâs. In astronomy-speak we use the term 1,800 solar radii to refer to this particular size.Y Canis Majoris a.k.a. VY CMa is about 4,900 light years from the Earth. This value, however, is just a rough estimate because it is too far for parallax to be used.