Ch15 - Assignment: Chapter 15 Class: Astronomy I Date:...

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Assignment: Chapter 15 Class: Astronomy I Date: October 22 nd , 2007 Review Questions 1. The discovery of Uranus in 1781 made many astronomers to wonder if there were other undiscovered planets that are too dim to be seen by the naked eye. Astronomers began to formulate possible ways and methods to spot and recognize any missing planets. 2. The Titius-Bode Law gave interest and somewhat hope to many astronomers seeking for missing planets. In 1801, a Sicilian astronomer Piazzi first spotted a dim uncharted star. And few months later, young German mathematician Karl Friedrich Gauss developed a general method of computing an object’s orbit in space, and predicted the star’s location. Piazzi named the object Ceres. 3. Modern astronomers use photography rather than scrutinizing the skies for faint, uncharted, starlike objects moving. Astronomers simply aim a camera-equipped telescope at the stars and take a long exposure. The orbital motion during the exposure leaves a distinctive trail on the photographic plate. 4. Asteroids are simply irregular shaped rocks that orbit the Sun, mostly occurring in a band asteroid belt between the orbits of Mars and Jupiter. Trans-Neptunian object is any object in the solar system that orbits the Sun at a greater distance on average than Neptune. 5. The region of our solar system between the orbits of Mars and Jupiter is called the asteroid belt. More than 10 5 asteroids are spread over a belt with a total area of 10 17 km 2 . Furthermore, many asteroids have orbits that are tilted out of the ecliptic. 6. Even if Jupiter did not exist, the collisions between planetesimals in the solar nebula would have left the asteroids in roughly circular orbits close to the ecliptic plane. 7. Kirkwood gaps are gaps or dips in the distribution of main belt asteroids with various semi-major axes. They correspond to the location of orbital resonances with Jupiter. 8. The satellites of Saturn exert gravitational forces on Saturn’s rings, and they shape the orbits of the ring particles to give rise to the ring’s structure. Jupiter’s gravitational forces either accelerate or slow down the objects in the asteroid belt,
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This note was uploaded on 08/25/2008 for the course ASTRON 1 taught by Professor Jsepikas during the Winter '07 term at Pasadena City College.

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Ch15 - Assignment: Chapter 15 Class: Astronomy I Date:...

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