The Sun formed about 4.6 billion years ago in a giant, spinning cloud of gas and dust called the solar nebula. As the nebula collapsed under its own gravity, it spun faster and flattened into a disk. Most of the nebula's material was pulled toward the center to form our Sun, which accounts for 99.8% of our solar system’s mass.

Our solar system formed about 4.5 billion years ago from a dense cloud of interstellar gas and dust. The cloud collapsed, possibly due to the shockwave of a nearby exploding star, called a supernova. When this dust cloud collapsed, it formed a …

Saturn took shape when the rest of the solar system formed about 4.5 billion years ago when gravity pulled swirling gas and dust in to become this gas giant. About 4 billion years ago, Saturn settled into its current position in the outer solar system, where it is the sixth planet from the Sun.

theory about the beginnings of the sun and planets. This theory explains that our solar system began as a spinning cloud of gas and dust about 4.5 billion years ago.

A History of Our Understanding of the Sun - A Closer Look. Pre-Twentieth Century Western Knowledge of the Sun. Ancient cultures, such as the Aztecs, the Mayans, the Hebrews, and the Egyptians, made careful observations of the motion of the sun through the sky.

Our hydrogen-burning sun belongs to a generation of stars created about 4.5 billion years ago from a cloud of interstellar dust, ice crystals and gas that collapsed to form the nebula from which the sun and the rest of the solar system grew.

When the solar system settled into its current layout about 4.5 billion years ago, Earth formed when gravity pulled swirling gas and dust in to become the third planet from the Sun. Like its fellow terrestrial planets, Earth has a central core, a rocky mantle, and a solid crust.

Asteroids, sometimes called minor planets, are rocky remnants left over from the early formation of our solar system about 4.6 billion years ago. The current known asteroid count is: . Most of this ancient space rubble can be found orbiting our Sun between Mars and …

When the solar system settled into its current layout about 4.5 billion years ago, Mars formed when gravity pulled swirling gas and dust in to become the fourth planet from the Sun. Mars is about half the size of Earth, and like its fellow terrestrial planets, it has a central core, a rocky mantle, and a solid crust.

In the sun's core neither hydrogen molecules nor neutral hydrogen atoms with one proton in the nucleus and one orbital electron are present. The violent, hot environment of the sun's center rips atoms apart into their constituent pieces: protons, electrons, and other bare atomic nuclei.