The following is current scientific evidence supporting the nebular theory on the formation of the solar system.'

a the composition of the inner and outer planets, current observations of star formation, and the motion of the solar system
b current observations of star formation and the path of comets
c current observations of the structure and motion of the solar system and the nebular galaxy
d the composition of the inner and outer planets and the amount of hydrogen and helium found in space

d is the best answer.

the second sun is a star from the sun

The correct answer is:

a) The composition of the inner and outer planets, current observations of star formation, and the motion of the solar system.

The nebular theory is the prevailing scientific explanation for the formation of the solar system. It suggests that the solar system formed from a rotating, collapsing nebula of gas and dust. Several pieces of scientific evidence support this theory:

1. Composition of the inner and outer planets: The nebular theory predicts that the inner planets, such as Mercury, Venus, Earth, and Mars, are composed mainly of rocky materials, while the outer planets, such as Jupiter, Saturn, Uranus, and Neptune, consist of gas and ice. The observed composition of the planets aligns with this prediction.

2. Observations of star formation: Current observations of star formation in other regions of our galaxy show that stars form from collapsing clouds of gas and dust, similar to the proposed formation of the solar system. These observations support the idea that the solar system formed from a collapsing nebula.

3. Motion of the solar system: The motion of the solar system, including the orbits and rotations of the planets, can be explained by the conservation of angular momentum in a rotating nebula. This is consistent with the predictions of the nebular theory.

b) Current observations of star formation and the path of comets are not directly related to supporting the nebular theory.

c) Current observations of the structure and motion of the solar system and the nebular galaxy are partially relevant, but they do not specifically address the composition of the inner and outer planets, which is a key aspect of the nebular theory.

d) While the composition of the inner and outer planets and the amount of hydrogen and helium found in space are important factors to consider, they do not alone provide comprehensive evidence for the nebular theory. Other factors, such as the observed motion of the solar system and star formation, need to be taken into account.

The correct answer is option C: current observations of the structure and motion of the solar system and the nebular galaxy.

The nebular theory is the widely accepted scientific explanation for how the solar system formed. According to this theory, the solar system began as a giant rotating cloud of gas and dust called a nebula. Over time, the nebula collapsed under its own gravity and formed a spinning disk. The central region of this disk eventually became the sun, while smaller clumps of material within the disk formed the planets, moons, asteroids, and other celestial bodies.

The current scientific evidence that supports the nebular theory comes from observations of the structure and motion of the solar system. Astronomers have observed that the planets and their moons all orbit the sun in roughly the same plane and in the same direction. This is consistent with the idea that they formed from a spinning disk of material.

Additionally, the nebular theory is supported by observations of other young star systems. Astronomers have observed disks of gas and dust around other stars, which are thought to be similar to the protoplanetary disk from which our own solar system formed. These observations validate the idea that the formation of our solar system was not unique.

It is important to note that options A, B, and D are not entirely correct because they do not include the necessary evidence from the structure and motion of the solar system and the observation of the nebular galaxy.