4.26 Astro 1 Section 1 Professor Brandt

4.26 Astro 1 Section 1 Professor Brandt - Astro 1 Section 1...

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Astro 1 Section 1 Professor Brandt Monday April 26th 1999 Announcements: Lecture notes: Lecture 43. We have some basic facts about the solar system we want to explain. Disk like shape - orbits in nearly same plane. Generally common direction of rotation and revolution. Two types of planets. Terrestrial inner planets - high density. Jovian outer planets - low density. Lots of debris throughout solar system - asteroids comets meteors. Common ages for Earth Moon Mars meteors Sun. We want a formation theory that naturally explains these facts. Also another relevant fact. Some nearby stars are observed to have disks of gas and dust surrounding them. These basic facts have led us to a model for the solar system. We believe star formation and planet formation are closely linked. Solar nebula theory. Formation of solar system was a gradual event. Not a catastrophic one. As stars form in contracting clouds they remain surrounded by cocoons of dust and gas - rotation of this cocoon leads to its collapse into a disk.
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