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... Many astrologers insist that a person’s Sun sign is strongly correlated with his or her choice of profession. Indeed, job counseling is an important function of modern astrology. Physicist John McGervey at Case Western Reserve University looked at biographies and birth dates of some 6,000 politician ...
Orbits
Orbits

... Although the assumption here has been that there are only two bodies involved in orbits, orbital motion described as “Keplerian” can involve many bodies in orbit, including the planets solar system ...
evidence for a distant giant planet in the solar system
evidence for a distant giant planet in the solar system

... value predicted from by the Kozai mechanism. Even more interestingly, a corresponding analysis of longitude of ascending node, as a function of the semimajor axis reveals a similarly strong clustering of these angles about Ω=113°±13° (Figure 1). Analogously, we note that longitude of perihelion, ...
The Solar System - MrCrabtreesScience
The Solar System - MrCrabtreesScience

... • Ptolemy looked at the motion of the stars and the planets and came up with ideas that helped Aristotle’s model work better • Ptolemy’s system had the planets spinning in large circles as they orbited earth. • This system more accurately predicted the motion of the planets but was very complex. ...
Three newly discovered sub-Jupiter-mass planets: WASP
Three newly discovered sub-Jupiter-mass planets: WASP

... resolved, 9–10-Gyr, G4+K3 binary, with a separation of 3.3 arcsec (≥800 au). WASP-84b is a sub-Jupiter-mass planet (0.69 MJup , 0.94 RJup ) in an 8.523-d orbit around an active, ∼1-Gyr, early-K dwarf. Of the transiting planets discovered from the ground to date, WASP-84b has the third-longest period ...
TNO Time Allocation Committee
TNO Time Allocation Committee

Reflection #12: The Journey Ends
Reflection #12: The Journey Ends

... appropriate for each learner. Be sure all students understand that such a voyage is imaginary to avoid any misconceptions that may otherwise arise. In activity two, the controversy regarding how Pluto should be classified is addressed, and an excellent example of the nature of science is provided. T ...
Electronic Text Book Unit 11
Electronic Text Book Unit 11

... vibrations. When electric current is applied to a quartz crystal, it vibrates at a regular frequency, depending on its shape and size. ...
Asynchronous rotation of Earth-mass planets in the habitable zone
Asynchronous rotation of Earth-mass planets in the habitable zone

... A first qualitative difference with previous works (3-5, 16, 17), is that we derive a very different functional form for the atmospheric torque. In particular, the function f (σ ) ≡ ba (2σ )/bg (2σ ) (5) is not monotonic around potential equilibria when a realistic rheology is used. As seen in Fig. ...
Presentation
Presentation

... or may only pass by sun once) – Spherical shell of matter up to 2 light years (65,000 A.U.) in radius. – Trillions of comets – Comets may come in from any direction, with prograde or retrograde orbits. ...
High-resolution simulations of the final assembly of Earth
High-resolution simulations of the final assembly of Earth

... mals, although these are still many orders of magnitude more massive than realistic planetesimals. The total mass in planetesimals and planetary embryos is 9.4 M⊕ , with roughly two thirds of the mass in planetesimals in the outer disk. The difference in total solid mass between simulations 0, 1 and ...
Tidal Venuses: Triggering a Climate Catastrophe via Tidal Heating
Tidal Venuses: Triggering a Climate Catastrophe via Tidal Heating

... librium state where they rotate faster than synchronous with an “equilibrium” or “pseudosynchronous” period. This aspect of tidal theory has been known for decades (e.g. Goldreich, 1966; Greenberg and Weidenschilling, 1984), but has only recently been pointed out for the case of exoplanets (Barnes ...
2nd Planet from the Sun
2nd Planet from the Sun

... Like Mercury, Venus was also originally thought to be 2 different planets They were called Eosphorus (morning star) and Hesperus (evening star) ◗ Venus is the 3rd brightest object in the sky (besides sun & moon) ◗ Because Venus is an inferior planet (between us and moon), it has phases as Galileo o ...
Discovery
Discovery

... ejected from the surface of Ida in a recent impact. However, astronomers now believe that the YORP effect may be responsible for the formation of Dactyl and satellites of other smaller asteroids. Specifically, when sunlight hits one of these smaller asteroids, the material absorbs some of the radiat ...
class slides for Chapter 9
class slides for Chapter 9

... instructors in teaching their courses and assessing student learning. Dissemination or sale of any part of this work (including on the World Wide Web) will destroy the integrity of the work and is not permitted. The work and materials from it should never be made available to students except by inst ...
C. _________Magnetosphere is the biggest thing in the
C. _________Magnetosphere is the biggest thing in the

... A. How is Pluto’s discovery similar to that of Neptune? Because they look the same B. What three facts made Pluto difficult to find? It’s not a planet any more, it has no water. C. Click on isn’t a planet at all and explain the controversy about Pluto. Pluto is no longer a planet, because it got los ...
Lecture #29
Lecture #29

star
star

... Knowing the mass can help us estimate how long it will shine and what its ultimate fate will be ...
Smallest Kuiper Belt Object Ever Detected
Smallest Kuiper Belt Object Ever Detected

... the orbit of Neptune to more than 5 trillion miles from the Sun. It contains numerous bodies called Kuiper belt objects (KBOs), the most famous being Pluto and its moons. Due to their small size, only the larger KBOs can be detected with direct imaging. Smaller objects, however, can be detected indi ...
Dynamical evolution of planetary systems
Dynamical evolution of planetary systems

... There are two possible mechanisms by which we envision that giant planets can form. The first is nicknamed the “core-accretion mechanism”: the coagulation of solid particles forms a core typically of about 10 Earth masses (M⊕ ) while the gas is still present in the proto-planetary disk; the core the ...
Solar System Tables
Solar System Tables

... and is also known as 1 astronomical unit (AU). 2The time it takes for light to travel from the Sun to the respective Planet. Light travels at 186,282 miles/sec (299,792 km/sec). 3Earth’s equatorial diameter is 7,926 miles (12,756 km). 4Earth’s mass is 1.32 x 1025 pounds (5.97 x 1024 kg). 5Earth’s vo ...
Solar System - Wikimedia Commons
Solar System - Wikimedia Commons

... Galileo Galilei first turned a telescope on the sky and began to write down what he saw. Among the things he saw were four moons orbiting Jupiter. As time passed and the telescope was improved, more objects were found. In 1655, Christiaan Huygens discovered the moon Titan orbiting Saturn. In 1781 Si ...
GMRT search for 150 MHz radio emission from the transiting
GMRT search for 150 MHz radio emission from the transiting

... to 104 times stronger emitters than Jupiter. However, the extreme physical conditions of “hot-Jupiters” could make this realizable, e.g., through a massive infall of Poynting flux on them (Zarka 2007). This provides the physical justification for the radio-magnetic scaling law proposed by Zarka et a ...
Stellarium Astronomy Software
Stellarium Astronomy Software

... 1. Place your planetarium in the corner of a room on a table or bookshelf. This allows the projection to cover walls and ceiling. A room with smooth light-colored walls and ceiling works best. A room that is approximately 12 x 12 feet provides the best projection quality. Star Theater 3.0 works best ...
Regular Keplerian motions in classical many-body
Regular Keplerian motions in classical many-body

... motions is immensely complicated. The marvel of closed orbits that are found in Keplerian motion, as well as their wonderful simplicity, vanishes. For example, the distortion of the Earth’s gravitational field from spherical symmetry causes the actual orbit of a satellite to differ from an ellipse. ...
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Definition of planet



The definition of planet, since the word was coined by the ancient Greeks, has included within its scope a wide range of celestial bodies. Greek astronomers employed the term asteres planetai (ἀστέρες πλανῆται), ""wandering stars"", for star-like objects which apparently moved over the sky. Over the millennia, the term has included a variety of different objects, from the Sun and the Moon to satellites and asteroids.By the end of the 19th century the word planet, though it had yet to be defined, had become a working term applied only to a small set of objects in the Solar System. After 1992, however, astronomers began to discover many additional objects beyond the orbit of Neptune, as well as hundreds of objects orbiting other stars. These discoveries not only increased the number of potential planets, but also expanded their variety and peculiarity. Some were nearly large enough to be stars, while others were smaller than Earth's moon. These discoveries challenged long-perceived notions of what a planet could be.The issue of a clear definition for planet came to a head in 2005 with the discovery of the trans-Neptunian object Eris, a body more massive than the smallest then-accepted planet, Pluto. In its 2006 response, the International Astronomical Union (IAU), recognised by astronomers as the world body responsible for resolving issues of nomenclature, released its decision on the matter. This definition, which applies only to the Solar System, states that a planet is a body that orbits the Sun, is massive enough for its own gravity to make it round, and has ""cleared its neighbourhood"" of smaller objects around its orbit. Under this new definition, Pluto and the other trans-Neptunian objects do not qualify as planets. The IAU's decision has not resolved all controversies, and while many scientists have accepted the definition, some in the astronomical community have rejected it outright.
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