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The Kuiper Belt, and the Early Evolution of the Outer Solar System
The Kuiper Belt, and the Early Evolution of the Outer Solar System

... • a vast swarm of giant comets orbiting just beyond Neptune – debris that failed to coalesce into another planet • nomenclature isn’t settled: Kuiper Belt, Edgeworth–Kuiper Belt, Trans–Neptunian Belt, etc. • members are: KBOs, EKOs, TNOs, etc. ...
Lab 5: Searching for Extra-Solar Planets
Lab 5: Searching for Extra-Solar Planets

... planet Jupiter would cause a shift in the sun’s spectrum of about 12 m/s. This is not much above the best errors in the method, which are now down to about 3-5 m/s. The star and the planet are each orbiting around the center of mass of the star+planet system. Suppose you observe the star regularly o ...
Unit 3: Understanding the Universe
Unit 3: Understanding the Universe

... Enduring Understandings The solar system contains planets, dwarf planets, comets, asteroids, and other small solar system bodies. ...
Powerpoint - BU Imaging Science
Powerpoint - BU Imaging Science

... Sun moving like this, he could determine the masses, orbital distances and eccentricities for Jupiter, Saturn, and so on using Newton’s Law of Gravity Massive planets far from Sun cause Sun to move the most distance Massive planets close to Sun cause Sun to move the ...
Geocentric vs. Heliocentric
Geocentric vs. Heliocentric

... 1632: "Dialogo Dei Massimi Sistemi" (In Italian! Not Latin! For the common people!) He published his masterpiece, Dialogue on the Two Chief World Systems, in which he had two people, one representing the view of Ptolemy and other the view of Copernicus, present their arguments before an intelligent ...
A Tour Of The Solar System
A Tour Of The Solar System

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Exoplanets for Amateur Astronomers
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American Scientist - Earth, Environmental and Planetary Sciences
American Scientist - Earth, Environmental and Planetary Sciences

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A report of the SEEDS Direct Imaging Survey
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Planetary Ellipses Exercise
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... (Mercury, Venus, Earth, Mars), four outer planets (Jupiter, Saturn, Uranus, Neptune), approximately three “dwarf planets,” more than 130 satellites (orbiting moons), an asteroid belt, and entering comets. As one ventures into space, the distances from one planet to another are vast. In fact, the sol ...
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No Slide Title

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Perfect Little Planet
Perfect Little Planet

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... Earth revolves around the Sun in and year and rotates on its axis in a 24-hour day. They have related this rotation of Earth to day and night while recognizing that the movements of the sun, moon, and stars are connected. SC.5.E.5.1: (DOK 1) Recognize that a galaxy consists of gas, dust, and many st ...
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Lecture 21: Planet formation III. Planet

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... along the sequence of the Zodiac. However, as the Earth moves around the Sun, our view of planets occasionally makes them appear to reverse their motion. Mars will have appeared to stop moving on January 24th, and a backing up motion will proceed until mid-April. Careful observers can use Regulus, t ...
Dead Earth – Lesson 2 – Solar System
Dead Earth – Lesson 2 – Solar System

... How conditions on planets change with distance from the Sun, and what other objects exist in the Solar system I will be successful if I can : Explain how the conditions on a planet change as the distance from the Sun increases ...
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Planets beyond Neptune



Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and culminated at the start of the 20th with Percival Lowell's quest for Planet X. Lowell proposed the Planet X hypothesis to explain apparent discrepancies in the orbits of the giant planets, particularly Uranus and Neptune, speculating that the gravity of a large unseen ninth planet could have perturbed Uranus enough to account for the irregularities.Clyde Tombaugh's discovery of Pluto in 1930 appeared to validate Lowell's hypothesis, and Pluto was officially named the ninth planet. In 1978, Pluto was conclusively determined to be too small for its gravity to affect the giant planets, resulting in a brief search for a tenth planet. The search was largely abandoned in the early 1990s, when a study of measurements made by the Voyager 2 spacecraft found that the irregularities observed in Uranus's orbit were due to a slight overestimation of Neptune's mass. After 1992, the discovery of numerous small icy objects with similar or even wider orbits than Pluto led to a debate over whether Pluto should remain a planet, or whether it and its neighbours should, like the asteroids, be given their own separate classification. Although a number of the larger members of this group were initially described as planets, in 2006 the International Astronomical Union reclassified Pluto and its largest neighbours as dwarf planets, leaving Neptune the farthest known planet in the Solar System.Today, the astronomical community widely agrees that Planet X, as originally envisioned, does not exist, but the concept of Planet X has been revived by a number of astronomers to explain other anomalies observed in the outer Solar System. In popular culture, and even among some astronomers, Planet X has become a stand-in term for any undiscovered planet in the outer Solar System, regardless of its relationship to Lowell's hypothesis. Other trans-Neptunian planets have also been suggested, based on different evidence. As of March 2014, observations with the WISE telescope have ruled out the possibility of a Saturn-sized object out to 10,000 AU, and a Jupiter-sized or larger object out to 26,000 AU.
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