1. GENESIS OF THE SUN (DATE:)
2. GOOGLE CHROME: NEW BROWSER IN TOWN. (DATE:)
3. A THEORY ON THE MESOZOIC. (DATE:)
1. GENESIS OF THE SUN (Date:)
Approximately 4.6 billion years ago, a cold cloud of gas and dust buried deep in one of the Milky Way galaxy's spiral arms started to collapse. Perhaps strong winds from a massive star or a shock wave from a nearby supernova explosion triggered the collapse — from our distance in time, we'll never know for sure.Whatever the cause, the force of gravity then started to work its magic: The cloud began to contract and fragment. One of those fragments was destined to become our Sun and the rest of the solar system. The other fragments also spawned stars that have long since moved away from their birthplace — there's no way to determine which ones might have been our siblings. But while the star-formation process was going full bore, our small part of the galaxy probably looked like the Orion Nebula (M42) or one of the other similar star-forming regions we see around us today.Let's head back to our budding solar system. As gravity continued to compress the solar nebula, the central region that would become the Sun drew in the vast majority of material. Because the nebula was rotating, however, not all of the gas and dust could fall into the proto-Sun being forged at the center. Instead, some of it formed a disk that ultimately would condense into the planets and other, smaller members of the solar system.The proto-Sun continued to contract and, as it did so, grew hotter. This persisted until its central temperature rose high enough to ignite the fires of nuclear fusion. The heat created by these nuclear reactions produced a pressure that counteracted the inward pull of gravity, and the object became the stable star we call the Sun.