Question

1. which planets have almost the same length of day? explain. 2. why do the planets and asteroids orbit the sun in the same plane? 3. how did the gravitational collapse affect the distribution of the material in the solar nebula? 4. in what ways does gravity influence the distribution of mass and the temperature within the solar nebula? 5. describe how the increased spinning of the solar nebula contributes to its flattening into a disc shape. 6. does the sun appear larger in the sky in winter or summer? explain.

Explanation:

1. Venus and Earth have almost the same length of day. Venus has a day - length of about 243 Earth days (retrograde rotation) and Earth has a day - length of about 24 hours. The rotation periods are somewhat comparable among the planets.

The increased spinning of the solar nebula causes material to move outward. Due to conservation of angular momentum, the material flattens into a disc as the spinning speed increases.

1. The planets and asteroids orbit the Sun in the same plane because the solar system formed from a rotating, flat disc - shaped solar nebula. Material in this disc coalesced to form the planets and asteroids, maintaining the same orbital plane.
2. Gravitational collapse caused the material in the solar nebula to concentrate towards the center, forming the proto - Sun. Material further out formed planetesimals and eventually planets. The collapse led to a central concentration of mass and a more dispersed outer region with planet - forming material.
3. Gravity causes mass to clump together in the solar nebula. Inward gravitational pull heats the material through compression, increasing the temperature. Higher mass regions have stronger gravitational pull, leading to more mass accumulation and higher temperatures in those areas.
4. As the solar nebula spins faster, the centrifugal force acting on the material increases. This force pushes the material outward perpendicular to the axis of rotation. The material flattens into a disc as a result of the balance between gravitational forces pulling inward and the centrifugal force pushing outward.
5. The Sun appears larger in the sky in winter. This is a psychological effect known as the moon illusion. In winter, the air is often clearer and the Sun is lower in the sky. Objects near the horizon appear larger to our brains than objects higher up, even though the actual angular size of the Sun remains relatively constant throughout the year.

Answer:

1. Venus and Earth have almost the same length of day. The increased spinning of the solar nebula causes it to flatten into a disc due to conservation of angular momentum.
2. The planets and asteroids orbit the Sun in the same plane because they formed from a flat - shaped solar nebula.
3. Gravitational collapse led to central concentration of mass and a dispersed outer region with planet - forming material in the solar nebula.
4. Gravity causes mass to clump and increases temperature through compression in the solar nebula.
5. The increased spinning of the solar nebula causes material to flatten into a disc due to the balance between gravitational and centrifugal forces.
6. The Sun appears larger in the sky in winter due to the moon illusion.