What is h^2o? is it a liquid or solid

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

hope this !

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.

the missing space is phylum

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .