The hypothesis that states the sun and planets developed out of the same cloud of gas and dust is called the nebular hypothesis.

Here's a breakdown:

* Nebular refers to a cloud of gas and dust.

* Hypothesis is a proposed explanation for a phenomenon.

The nebular hypothesis is the prevailing scientific model for the formation of our solar system. It proposes that:

1. A giant cloud of gas and dust (nebula) collapses under its own gravity. This collapse creates a spinning disk.

2. The center of the disk becomes hot and dense, eventually forming the Sun.

3. Material in the outer parts of the disk clumps together, forming planets, moons, asteroids, and comets.

While the nebular hypothesis has been refined over time, it remains the most widely accepted explanation for the formation of our solar system.