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The Twin Planets (Uranus and Neptune)

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A powerpoint presentation I made for our physics class. It was actually a group thing but I had to edit and start all over again but this looks not that good for me because this is a result of "cramming"! If you were part of my physics class, I swear, God bless!

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The Twin Planets (Uranus and Neptune)

  2. 2. Blue-GreenGiantUranus is the seventh planetfrom the sun in our solarsystem. This giant ball of gasand liquid is about four times aslarge as Earth, and its coveredby methane clouds. It isbelieved that Uranus is coveredin ammonia and water oceanssurrounding a rocky corebelieved to be the size of Earth.In 1986, Voyager 2 passed bythe planet, illuminating theblue-green gas giant as neverbefore.
  3. 3. Uranus inColorUranus is in some ways most like itsneighbor Neptune, but in others it isfantastically different. While Neptunewas the first planet to be discovered bymathematical prediction, Uranus was thefirst planet to be discovered bytelescope. It was first revealed in March1781 by English astronomer Sir WilliamHerschel. Here the top picture showsUranus as the human eye sees it. Thebottom picture shows Uranus throughultraviolet, violet and orange filters toillustrate the contrast of gases.
  4. 4. High-level haze onUranusThis computer-enhanced photo takenby Voyager 2 shows the high levels ofhaze in Uranus upper atmosphere.While the planet closely resemblesNeptune in composition,Uranus emits less colorfulwavelengths, making it a somewhatbland planet in comparison. NASAbelieves this is because the planetsinternal heat is lower than the othergas giants. Because Neptune is atsuch an extreme axial tilt, the planetexperiences different and sometimesviolent seasons.
  5. 5. Hubble finds many bright clouds on UranusThis image was taken in 2007 bythe Hubble Space Telescope. Itshows the cloud bands, rings andmoons of the planet. These aretheplanets four major rings and 10of its many known satellites.The five main satellites of Uranusare calledMiranda, Ariel, Umbriel, Titaniaand Oberon. Uranus also has themost unique positioning among allthe planets, as it tilts almostcompletely on its side. Where mostplanets have itsequator, Uranus has its north and
  6. 6. Miranda as seen by Voyager 2The moon Miranda is named for thedaughter of Prospero in "The Tempest."It is seen here in a photo taken fromVoyager 2 in 1986. It is the smallest ofUranus largest satellites, but it isconsidered perhaps one of the mostintriguing moons in the solar system.Made of ice and rock, Mirandas surfaceis made up of ancient and newersurfaces, a rarity in planetary geology.Some experts believe this combinationof surfaces was caused by partly meltedice upwells forced new surfaces intoexistence while other experts think thatMiranda may have literally shatteredand reformed itself over the centuries.
  7. 7. Crescent UranusThis photo, taken by Voyager 2, showsa color composite of threephotographs taken throughblue, green and orangefilters. Voyager 2, launched in1977, photographed Jupiter in1979, Saturn in 1981, Uranus in 1986and Neptune in 1989. What it did notclarify was the pronunciation ofUranus, which can cause somegiggles. Some astronomers stress thefirst syllable of the word: in otherwords, yoor-uh-nuhs. However, it isacceptable to pronounce the name ofthe planet with an emphasis on thesecond syllable as well.
  8. 8. A rare eclipse on UranusIn 2006, the Hubble SpaceTelescope caught a rare view of aneclipse on Uranus. Uranus has anextremely strong magnetosphere.Its atmosphere is comprisedmostly of hydrogen and smalleramounts of helium and methane.Further, it averagesaround 2,870,972,200 kilometers(1,783,939,400 miles) from theSun. And while its atmosphere isextremely cold, experts estimatethat the oceans can reach atemperature as high as 4,200degrees F (2,300 degrees C).
  9. 9. Voyager 2s finalimage of UranusThis photo, taken in 1986, was thefinal image released by NASA ofUranus before the spacecraft beganits journey to Neptune. Uranus alsohas the distinction of being the onlyplanet named after a god from Greekmythology, as opposed to Roman. Inthe 18th century, Germanastronomer Johann Bode suggestedthat the planet be named for thefather of Saturn, as Saturn is namedfor the father of Jupiter. In 1850, thename Uranus became the universaltag for the planet.
  10. 10. •You can see Uranus with the unaided eye•Uranus has only been visited once•You can see Uranus with the unaided eye•Uranus has only been visited once•You can see Uranus with the unaided eye•Uranus has only been visited once•You can see Uranus with the unaided eye•Uranus has only been visited once•You can see Uranus with the unaided eye•Uranus has only been visited once•You can see Uranus with the unaided eye•Uranus has only been visited once•You can see Uranus with the unaided eye
  11. 11.
  12. 12. 2011:•Neptune completes its first 165-year orbit of thesun since its discovery in 1846.2003:•Using improved observing techniques,astronomers discover five new moons orbitingNeptune.2005:•Scientists using the Keck Observatory image theouter rings and find that some of the ring arcs havedeteriorated.
  13. 13. The blueplanetThe beautiful blue orb ofNeptune, named for the Roman god ofthe sea, is the eighth and farthestplanet in our solar system from the sun.This honor used to reside with Plutountil it was demoted from planetstatus by the InternationalAstronomical Union. Neptunes equatoris four times as long as Earths. It is 17times as heavy, though not as dense.We have one moon, while Neptune has13. And now, thanks to the Voyager 2spacecraft and the Hubble SpaceTelescope, we can see Neptune as
  14. 14. Hubble captures dynamicatmosphereNeptune is one of two planets notvisible to Earth by the naked eye. Thisis perhaps the main reason why it wasthe first planet to be discovered bymathematical prediction. It wasseparately discovered in the mid-19thcentury by English astronomer John C.Adams and French mathematicianUrbain Le Verrier. The planet iscovered by thick clouds that moverapidly. NASA reports that Neptuneswinds move at speeds up to 700 mph.This color-enhanced photo taken bythe Hubble telescope in 2005 showsNeptune as never seen before.
  15. 15. HurricanesHere two great hurricanes can beseen spinning on Neptunessurface. This photo was taken inAugust 1989 by Voyager 2, the onlyspacecraft to travel to Neptune. TheGreat Dark Spot is seen to thenorth, while Great Spot 2, with itswhite center, is more to the south.The white clouds in between werenicknamed "The Scooter" by NASA.The storms were thought to beswirling masses of gases similar tohurricanes on Earth. But whenHubble turned its telescope onNeptune in 1994, the storms haddisappeared.
  16. 16. On Tritons horizonVoyager 2 generated this computerimage of Neptune as seen from itsmoon, Triton. Triton is Neptuneslargest satellite and is the onlymoon in the solar system to orbitopposite of its planet. Expertsbelieve that Triton may have been alarge comet that orbited the sun butgot caught in Neptunesgravitational pull. Triton boasts thecoldest known temperatures in thesolar system, at minus 390 degrees F(thats minus 235 degrees C). NASAhas discovered evidence ofammonia and water volcanoes onTriton.
  17. 17. Crescents of Tritonand NeptuneWhen Voyager 2 took thisimage, it "was plungingsouthward at an angle of 48degrees to the plane of theecliptic," according to NASA.Besides its 11 satellites, Neptunealso boasts a planetary ringsystem. The three main rings arenamed for Neptunes firstresearchers, the Adams ring, theLa Verrier ring and the Gallering. But recent evidence showsthat the rings are unstable andmay be deteriorating in spots.
  18. 18. Great Dark SpotVoyager 2 took this photoof Neptunes gigantic anti-cyclonic storm in 1989.Considered to be much likeJupiters Red Spot, thestorm was thought to span8,000 by 4,100 miles. It wasbelieved to have a vortexstructure. When Hubbleturned its lens on Neptunein 1994, the Great DarkSpot was found to havevanished. A new storm justlike it was found roamingthe northern hemisphere ofthe planet.
  19. 19. Mosaic of TritonThis global color mosaicof Triton was taken byVoyager 2 in 1989. LikeEarth, Triton is thoughtto have a nitrogen-richatmosphere, and it isthe only satellite in thesolar system that has anitrogen ice surface.The blue-green bandacross Triton is thoughtto be nitrogenfrost, while the pink isthought tobe methane ice.
  20. 20. CloudsVoyager 2 took this image ofNeptune in 1989, two hoursbefore it made its closestapproach to the planet.Neptunes surface is not likeEarths. While these thickclouds cover the surface, theinterior of the planet is madeup of heavy, compressedgases. Its core is composed ofrock and ice. What does thefuture hold for Neptune andits moons? In 2005, a team ofresearchers backed by NASAcame up with a plan to land ateam of explorers on Triton.
  21. 21. Ricardo Abapo