Lesson 1.3 & 1.4 Nebular & Encounter Theories PDF

 Lesson 1.3 nebular theory Prepared by: Teacher Kamila  objectives explain the origin of the solar 01 system based on the nebular theory; identify the proponents of 03...

 Lesson 1.3 nebular theory Prepared by: Teacher Kamila  objectives explain the origin of the solar 01 system based on the nebular theory; identify the proponents of 03 the nebular theory; and 02 describe how planets were formed based on the nebular theory; the nebular theory A nebula is defined by NASA as giant cloud of gas and dust in space. This interstellar cloud of dust contains hydrogen, helium and other ionized gases. Major Steps in the Formation of the Solar System 01 CLOUD COLLAPSE FORMATION OF 02 PROTOPLANETARY DISK 03 GROWTH OF PLANETS the nebular theory According to the Nebular Theory, the solar system originated from a nebula. It is the widely accepted view about the formation of the solar system some 4.5 billion years ago.  CLOUD COLLAPSE Hypothetically, a shockwave from a supernova or the effect of a passing star may cause a cloud collapse. The collapse at the center of the cloud due to gravity occurs when gas pressure becomes insufficient to support the mass of the cloud. The collapsed cloud of interstellar gas and dust results to a smaller radius which means it will spin faster.  FORMATION OF PROTOPLANETARY DISK METALS AND SILICATES MERCURY VENUS EARTH MARS Terrestrials SUN JOVIAN JUPITER SATURN URANUS NEPTUNE LOWER TEMPERATURES GROWTH OF PLANETS PLANETESIMAL Planetesimal is a small celestial body that once collide together, it tend to fused to form the planets of the solar system.  PROPONENTS OF THE NEBULAR THEORY Emanuel Swedenborg Immanuel Kant Pierre-Simon Laplace KEY POINTS Nebular Theory, the solar system 01 originated from a nebula. Nebula is a giant cloud of gas 02 and dust in space. Nebular theory proposes that the solar 03 system was formed through three major steps: cloud ​collapse, formation of protoplanetary disk and ​growth of planets​. KEY POINTS Terrestrial planets are closer to the sun and have higher metallic 04 and silicate compounds. Jovian planets are farther from the sun where the lower temperature allows gas to condense. Nebular theory was proposed 05 by Emanuel Swedenborg, Immanuel Kant, and Pierre- Simon Laplace.  Lesson 1.4 ENCOUNTER THEORY Prepared by: Teacher Kamila  objectives explain the origin of the solar identify the proponents of 01 system based on the 03 the planetesimal theory and encounter theory; tidal theory; and 02 differentiate the planetesimal 04 enumerate the drawbacks theory from the tidal theory; of the planetesimal theory and tidal theory.  THE ECOUNTER THEORY The Encounter Theory proposes that the planets were formed from the material ejected from the sun during an encounter with another celestial object, such as another star. PLANETESIMAL THEORY Planetesimal Theory​, is a form of encounter theory. It proposes that a passing star termed as intruding star nearly collided with the protosun. The massive gravitational pull of the intruding star causes the protosun to eject filaments of material which then condensed into planetesimals. This theory describes how Earth started from a solid mass smaller than its present size.  PROPONENTS OF THE PLANETESIMAL THEORY Thomas Forest Ray Chrowder Moulton Chamberlin THE TIDAL THEORY THE TIDAL THEORY The Tidal Theory explains that the solar system formed as a result of a near collision between a passing star and the sun. This theory proposes that the hot gas from the passing star condensed into planets instead of condensing into planetesimals.  PROPONENTS OF THE TIDAL THEORY JAMES JEANS Harold Jeffreys  Thank you for listening! QUIZ # 1 SEPTEMBER 6 , 2024 FRIDAY