* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Chapter-3-Section-1-p.-64-67-Cornell
Astrobiology wikipedia , lookup
IAU definition of planet wikipedia , lookup
Cygnus (constellation) wikipedia , lookup
Outer space wikipedia , lookup
Spitzer Space Telescope wikipedia , lookup
Aquarius (constellation) wikipedia , lookup
Theoretical astronomy wikipedia , lookup
Extraterrestrial life wikipedia , lookup
Cosmic dust wikipedia , lookup
Directed panspermia wikipedia , lookup
Planetary habitability wikipedia , lookup
Comparative planetary science wikipedia , lookup
Advanced Composition Explorer wikipedia , lookup
History of Solar System formation and evolution hypotheses wikipedia , lookup
Timeline of astronomy wikipedia , lookup
Solar System wikipedia , lookup
Crab Nebula wikipedia , lookup
Nebular hypothesis wikipedia , lookup
Star formation wikipedia , lookup
Formation and evolution of the Solar System wikipedia , lookup
Astronomy - Chapter 3 Section 1: A Solar System is Born p. 64-67 Vocabulary/Main Ideas The Solar Nebula Nebula Details and Supporting Facts o A large cloud of gas and dust in interstellar space; a region in space where stars are born or where stars explode at the end of their lives o Gravity and pressure interact in a nebula to form stars Gravity Pulls Matter Together o The gravitational attraction in a nebula is very weak, but it holds the gas and dust together Pressure Pushes Matter Apart o In a nebula, outward pressure balances the inward gravitational pull and keeps the cloud from collapsing Upsetting the Balance o The balance between gravity and pressure can be upset if two nebulas collide or a nearby star explodes o Globules form and contract, collapse inward, and the temperature rises and stars begin to form Solar Nebula o The cloud of gas and dust that formed our solar system How the Solar System Formed (See Figure 3 on p. 65) 1) The young solar nebula begins to collapse 2) The solar nebula rotates, flattens, and becomes warmer near its center 3) Planetesimals begin to form within the swirling disk 4) As the largest planetesimals grow in size, their gravity attracts more gas and dust 5) Smaller planetesimals collide with larger ones and planets begin to grow 6) A star is born and the remaining gas and dust are blown out of the new solar system Pictures and Diagrams Astronomy - Chapter 3 Section 1: A Solar System is Born p. 64-67 From Planetesimals to Planets o Bits of dust continued to collide within the solar nebula, and grew into large bodies called planetesimals. Gas Giant or Rocky Planet? o The largest planetesimals formed near the outside of the rotating solar disk, where hydrogen and helium were located. These grew and became the gas giants – Jupiter, Saturn, Uranus and Neptune. o It was too hot in the center of the nebula for gases to remain, so the rocky planets Mercury, Venus, Earth, and Mars formed here. The Birth of a Star o As the planets were forming within the nebula, the center became so dense and hot that hydrogen atoms fused to form helium o Fusion released huge amounts of energy and created enough outward pressure to balance the inward pull of gravity. When the gas stopped collapsing, the sun was born and our solar system was complete!