الكون والنظام الشمسى: نظريات نشأة المجموعة الشمسية - نظرية السديم

The Nebular Theory, proposed by Pierre-Simon Laplace, suggests that the solar system formed from a rotating gaseous nebula. As the nebula cooled and contracted, it spun faster, leading to the formation of a flat, rotating disk. Centrifugal force caused parts of the nebula to separate, forming gas rings that eventually cooled and solidified into planets. The remaining central mass became the sun.

What inspired Pierre-Simon Laplace to develop the Nebular Theory?

• The study of comets

• The discovery of new planets

• The observation of distant galaxies

• The presence of nebula-like clouds and rings around planets

According to Laplace, what was the initial form of the solar system?

• A series of icy comets

• A solid mass

• A collection of small asteroids

• A glowing gaseous sphere

What effect did the loss of heat have on the nebula?

• It split into multiple smaller nebulae

• It became a solid mass

• It contracted and increased its rotation speed

• It expanded and slowed down

What caused the nebula to lose its spherical shape?

• Impact from a large asteroid

• Centrifugal force from its rotation

• Magnetic fields in space

• Gravitational pull from nearby stars

How did the planets of the solar system form according to the Nebular Theory?

• From the accumulation of space dust

• From the collision of large asteroids

• From the cooling and solidification of gaseous rings

• From the explosion of a nearby star