Changes

However within our Milky Way [[galaxy]] it is one of probably 100 billion of the same types of stars.

However within our Milky Way [[galaxy]] it is one of probably 100 billion of the same types of stars.

By mass, it is composed of 72% [[hydrogen]], 26% [[helium]] and 2% trace elements of [[oxygen]], [[carbon]], [[neon]], [[nitrogen]], [[magnesium]], [[iron]], and [[silicon]].<ref>[http://www.nasa.gov/worldbook/sun_worldbook.html World Book Encyclopedia @ NASA]</ref>

By mass, it is composed of 72% [[hydrogen]], 26% [[helium]] and 2% trace elements, mostly [[oxygen]], [[carbon]], [[neon]], [[nitrogen]], [[magnesium]], [[iron]], and [[silicon]].<ref>[http://www.nasa.gov/worldbook/sun_worldbook.html World Book Encyclopedia @ NASA]</ref>

Core temperatures reach 15,000,000 K (K = Kelvin) while the sun's surface or ''photosphere'' temperature is 5,800 K. When the photosphere is hit by the heat of the sun the temperature drops to a minimum of 4,000 K. It then continues further until it encounters a thin layer of [[atmosphere]] roughly 10,000 kilometers deep called the ''chromosphere'' and reverses trend to rise to 8,000 K. Even further is another part of the sun's total atmosphere called the ''corona'' that blends in with interplanetary space.

Core temperatures reach 15,000,000 K (K = Kelvin) while the sun's surface or ''photosphere'' temperature is 5,800 K. When the photosphere is hit by the heat of the sun the temperature drops to a minimum of 4,000 K. It then continues further until it encounters a thin layer of [[atmosphere]] roughly 10,000 kilometers deep called the ''chromosphere'' and reverses trend to rise to 8,000 K. Even further is another part of the sun's total atmosphere called the ''corona'' that blends in with interplanetary space.