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Orion Nebula: Star-forming Region. Solar Nebula Flattening the Solar Nebula.

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Presentation on theme: "Orion Nebula: Star-forming Region. Solar Nebula Flattening the Solar Nebula."— Presentation transcript:

1 Orion Nebula: Star-forming Region

2 Solar Nebula

3 Flattening the Solar Nebula

4 Disks Around Other Stars

5 Steps in Planet Formation 1.Condensation 2.Accretion 3.Nebular Capture (Jovian Planets only) After planets form, the solar wind clears the nebula: gas and dust are blown away

6 Condensation and Temperature Metals: iron, nickel, aluminum, and other metals can solidify around 1600 K Rocks: primarily silicon-based minerals solidify around 500-1300 K Hydrogen Compounds: molecules of methane, ammonia, and water freeze into ices below 150 K Light gases: hydrogen and helium never condense in the solar nebula



9 Accretion into Planetesimals Condensed materials collide and stick together forming planetesimals Planetesimals would continue to grow from further accretion and gravity Larger planetesimals would form spherical shapes because of stronger self-gravity Some planetesimals would fragment due to collisions

10 Planetesimals to Planets

11 Self-gravity

12 Uncompressed Densities

13 Nebular Capture: Jovian Planets Larger planetesimals of the Jovian planets resulting in a stronger gravitational force Stronger gravity allowed the Jovian plantes to capture more gas and planetesimals Hydrogen and Helium gas could be captured despite low mass of these gases Jovian planets formed disk-shaped nebulae Lower temperatures meant Hydrogen and Helium gas would not escape from the Jovian planets

14 Nebular Capture: Jovian Planets

15 The Sun’s Lost Spin Magnetic field of the Sun drags charged particles in the disk of the solar nebula. This causes friction which slows down the rotation of the Sun Otherwise, the Sun should have a faster spin than is observed

16 A History of Impacts

17 Captured Moons of Mars

18 Leftover Planetesimals


20 Radioactive Dating

21 Detecting Extrasolar Planets


23 Extrasolar Planets

24 More Extrasolar Planets

25 First Direct Detection! Planet Orbiting the star HD209548 Eclipsed by planet

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