Which of these statements is most likely correct about the nebular theory of formation of planetary systems?

select one:
a. it predicts facts and evidences for non-observable scientific research.
b. it describes events in nature which are non-observable and non-testable.
c. it is a universal theory which cannot be challenged by new experimentations.
d. it is a valid explanation because it is based on the investigation of current evidences.

a. It predicts facts and evidences for non-observable scientific research

Explanation:

Nebular theory explains that the Solar System was formed from a nebula that surrounded a very dense nucleus with high temperatures. It had a spinning motion that caused the cooling of its outer layers and the disintegration of the nebula into various rings. The Pedro Valcárcel November / 2010 1 Group of Cosmology condensation of these would give rise to the formation of the planets and their nucleus the Sun. However, the influence of Maxwell caused the abandonment of the nebular theory and the scientists focused their interest on the calls catastrophic theories, is a theory that predicts facts and evidences for non-observable scientific research.

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

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not sure if this is what you'r looking for eubacteria and archaebacteria