the production and discharge of something, especially gas or radiation

the range of wavelengths or frequencies over which electromagnetic radiation extends

luminous envelope of a star from which its light and heat radiate

the rarefied gaseous envelope of the sun and other stars

The Sun's is normally visible only during a total solar eclipse,

a colorless, odorless, highly flammable gas, the chemical element of atomic number 1

chemical element of atomic number 2, an inert gas which is the lightest member of the noble gas series.

a quantity or aggregate of matter usually of considerable size

the degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch

a spot or patch appearing from time to time on the sun's surface, appearing dark by contrast with its surroundings

each of more than one hundred substances that cannot be chemically broken down into simpler substances and are primary constituents of matter

a contracting mass of gas which represents an early stage in the formation of a star, before nucleosynthesis has begun.