A, i think. i don't know a lot but i think a makes the most sense.
A measure of the amount of light given off by a star is its absolute luminosity or magnitude. Absolute magnitude<span> is the measure of </span>intrinsic brightness<span> of a celestial object. It is the hypothetical </span>apparent magnitude<span> of an object at a standard </span>distance<span> of exactly 10 </span>parsecs<span> (32.6 </span>light years<span>) from the </span>observer<span>, assuming no </span>astronomical extinction<span> of starlight. </span>
Similar
Australia, France, Britain
Different
China
Russia
Ukrain
<span>" "both positive and negative temperature feedback loops.</span>
Lingua Franca is a language that people of different languages use to communicate. The answer is English.
