Evolutionary Theory: A Brief Overview

[1] Nebular Hypothesis
Definition from: University of Tennessee Knoxville; Astronomy 101: The Origin of the Solar System

Evidence for the Nebular Hypothesis: Because of the original angular momentum and subsequent evolution of the collapsing nebula, this hypothesis provides a natural explanation for some basic facts about the Solar System: the orbits of the planets lie nearly in a plane with the sun at the center (let's neglect the slight eccentricity of the planetary orbits to simplify the discussion), the planets all revolve in the same direction, and the planets mostly rotate in the same direction with rotation axes nearly perpendicular to the orbital plane.

Comment: One important note to the above description is the use of the highlighted word (my emphasis) mostly. Venus rotates on its axis in the opposite direction of the other planets in the Solar System, with the exception of Uranus. Uranus has an axial rotation which is almost perpendicular to the Sun. This presents a significant problem for the Nebular Hypothesis since the accretion of the solar disc would necessitate that all planets rotate in the same direction.

More information on the Nebular Hypothesis can be found at the In6Days section: Creation, Evolution, and the Principles of Science

[2] naturalism
Wikipedia: Wikipedia: Naturalism (philosophy), last modified May 9, 2013

Naturalism refers to the viewpoint that laws of nature (as opposed to supernatural ones) operate in the universe, and that nothing exists beyond the natural universe or, if it does, it does not affect the natural universe.

[3] Prebiotic
Existing or occurring before the origin of life

Return to \ Evolutionary Theory: A Brief Overview