URANUS - PowerPoint PPT Presentation

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  2. WHAT IS URANUS? • Uranus is the seventh planet from the Sun. It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System. It is named after the ancient Greek deity of the sky Uranus (Ouranos), the father of Kronos (Saturn) and grandfather of Zeus (Jupiter). Though it is visible to the naked eye like the five classical planets, it was never recognized as a planet by ancient observers because of its dimness and slow orbit. Sir William Herschel announced its discovery on March 13, 1781, expanding the known boundaries of the Solar System for the first time in modern history. Uranus was also the first planet discovered with a telescope. Too many words- use keywords only. Balance with images. Don’t cram too much info into one slide- make more slides instead.

  3. STRUCTURE • Like the other gas giants, Uranus is mostly atmosphere, with a rocky core that occupies a small fraction of the total diameter. The dominant atmospheric constituents are hydrogen (83%) and helium (15%), with about 2% methane and small amounts of acetylene and other hydrocarbons. These gases form a deep, relatively clear region overlying a thick, unbroken layer of white cloud made of frozen hydrogen sulfide and ammonia particles, overlaid by a haze of condensed methane.

  4. MOONS • Uranus has 27 known moons, all of which are named after characters from the works of William Shakespeare and Alexander Pope. 10. Belinda11. Perdita12. Puck13. Cupid14. Miranda15. Francisco16. Ariel17. Umbriel18. Titania 19. Oberon20. Caliban21. Stephano22. Trinculo23. Sycorax24. Margaret25. Prospero26. Setebos27. Ferdinand

  5. CLIMATE • At ultraviolet and visible wavelengths, Uranus's atmosphere is remarkably bland in comparison to the other gas giants, even to Neptune, which it otherwise closely resembles. When Voyager 2 flew by Uranus in 1986, it observed a total of ten cloud features across the entire planet. One proposed explanation for this dearth of features is that Uranus's internal heat appears markedly lower than that of the other giant planets. The lowest temperature recorded in Uranus's tropopause is 49 K, making Uranus the coldest planet in the Solar System, colder than Neptune.

  6. INTERNAL STRUCTURE • Uranus's mass is roughly 14.5 times that of the Earth, making it the least massive of the giant planets. Its diameter is slightly larger than Neptune's at roughly four times Earth's. A resulting density of 1.27 g/cm3 makes Uranus the second least dense planet, after Saturn. This value indicates that it is made primarily of various ices, such as water, ammonia, and methane. The total mass of ice in Uranus's interior is not precisely known, as different figures emerge depending on the model chosen; it must be between 9.3 and 13.5 Earth masses. Hydrogen and helium constitute only a small part of the total, with between 0.5 and 1.5 Earth masses. The remainder of the non-ice mass is accounted for by rocky material. Improve your outline so the report flows smoothly. You already discussed structure in slide 3. Better if you group similar slides together.


  8. RINGS • Like the other gas planets, Uranus has rings. Like Jupiter's, they are very dark but like Saturn's they are composed of fairly large particles ranging up to 10 meters in diameter in addition to fine dust. There are 13 known rings, all very faint; the brightest is known as the Epsilon ring. The Uranian rings were the first after Saturn's to be discovered. This was of considerable importance since we now know that rings are a common feature of planets, not a peculiarity of Saturn alone.

  9. MORE ABOUT URANUS • Uranus is the seventh planet from the Sun and the third largest (by diameter). Uranus is larger in diameter but smaller in mass than Neptune. • orbit: 2,870,990,000 km from Sun diameter: 51,118 km (equatorial) • mass: 8.683e25 kg Please add information on behavior: orbit, rotational speed, axial tilt, etc. So far, all you discussed is structure.

  10. ABOUT WILLIAM HERSCHELNovember 15, 1738 - August 25, 1822 • FULL NAME: Frederick William Herschel • Born: 15-Nov-1738Birthplace: Hannover, Hanover, GermanyDied: 25-Aug-1822Location of death: Slough, Buckinghamshire, EnglandCause of death: unspecifiedRemains: Buried, St. Laurence Churchyard, Upton, Berkshire, England This is better in the beginning when you mention you discovered the planet- just don’t dwell too much on this since it is not very important for us.


  12. ------END OF PRESENTATION------ Cite your references. Your report is too plain. Make it more exciting with images.