• Study Resource
  • Explore Categories
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
Fifth Planet
Fifth Planet

... fifth planet hypothetical wikipedia - in the history of astronomy a handful of solar system bodies have been counted as the fifth planet from the sun under the present definition of a planet jupiter is, fifth planet productions homepage - fifth planet productions based in the hills of huddersfield w ...
Smashing White Dwarfs
Smashing White Dwarfs

... Lensky’s duel.
 Watercolor by 
 Ilya Repin (1899) ...
Venus
Venus

... This is a planet on which a person would asphyxiate in the poisonous atmosphere, be ______________ in the extremely high heat, and be ______________ by the enormous atmospheric pressure. Venus is also known as the "morning star" or the "evening star" since it is visible and very _____________ at ei ...
CHAPTER 8 Survey of Solar Systems
CHAPTER 8 Survey of Solar Systems

... Although the two categories of planets neatly describe the eight most massive objects that orbit the Sun, astronomers have found many smaller objects that fit neither category. Pluto has long failed to fit, because of its small size, composition of ice and rock, and odd orbit. Not only is its orbit ...
Sample pages 2 PDF
Sample pages 2 PDF

... far, could this planet possibly have existed in the formation of the Solar System? It seems unlikely. The more accepted theory is that the asteroids in the belt are not those of a planet that never formed but the debris left by the formation of other planets. The Asteroid Belt may well just be a dum ...
Midterm Study Game
Midterm Study Game

... per minute. They used two identical containers. What is the test (independent) variable and the outcome (dependant) variable in this experiment? A) Test = # of crickets, Outcome = temperature B) Test = containers, Outcome = temperature C) Test = # of cricket chirps, Outcome = temperature D) Test = t ...
Students - Challenger Learning Center
Students - Challenger Learning Center

... years to study. We estimate the diameter to be around 142,000 km (88,700 miles). Although it will take time to learn about this planet, we have begun collecting some data we want to share with you. Because the planet is made mostly of gas, we have decided to set base camp on one of its 4 large moons ...
Neptune, Pluto and Quaoar
Neptune, Pluto and Quaoar

... The discovery of Neptune represents one of the most controversial episodes in the history of British science. It concerns the failure of British astronomers to discover the planet despite the existence of calculations that predicted its existence. In 1781, Sir William Herschel used a telescope to di ...
A Unit 5 Videoscript
A Unit 5 Videoscript

... Mercury, Venus, Earth, and Mars.” Zeek: “Our beautiful blue Earth is the third planet.” SC: “Yes, Commander.” Zeek: “Venus is the hottest planet, even though Mercury is closest to the sun.” SC: “Venus is hotter than Mercury because it has thick gas clouds all over it that trap in the sun’s h ...
answers2008_09_BC
answers2008_09_BC

...  Mass and temperature of He core steadily increasing. At tip of RGB, He fusion ignites in core – star moves quickly to horizontal branch on HRD (where depends on heavy element content) [1]  When He exhausted in core, He fusion starts in shell, and star reascends red giant branch. At this stage it ...
MAPPING THE SOLAR SYSTEM
MAPPING THE SOLAR SYSTEM

... Spent several years at European universities studying astronomy ...
January SKY Newsletter 2012
January SKY Newsletter 2012

... January 1 was First Quarter, so if you plan to do telescope observations of the Moon, do so immediately or wait until toward the end of the month after New Moon. By January 31, we are back to First Quarter! Of course, you can observe the Moon at almost any time without a telescope, sometimes as an e ...
Chapter 15 The Solar System
Chapter 15 The Solar System

... Why the moon Earth and the other planets orbit the sun. Why doesn’t the force of does not fall to gravity pull the Earth into the sun (or the moon into Earth)? To Earth answer the question, imagine kicking a ball off the ground at an angle (Figure 15.5). If you kick it at a slow speed, it curves and ...
Diapozitivul 1
Diapozitivul 1

... National College Iasi ...
Name
Name

... Base your answers to question 5 on the diagram in below. The diagram shows Earth revolving around the Sun. Letters A, B, C, and D represent Earth’s location in its orbit on the first day of the four seasons. Aphelion (farthest distance from the Sun) and perihelion (closest distance to the Sun) are l ...
Weighing a Black Hole
Weighing a Black Hole

... data is show below. We see that there are a few key differences. First there are many fewer points and second the true orbits of these stars are inclined with respect to the paper. It is not possible to show the inclination in 2 dimensions so for the lab we projected all the orbits on into the plane ...
Galileo & the Telescope— Sept 20
Galileo & the Telescope— Sept 20

... fixed stars, the Milky Way, nebulous stars, but especially about the four planets flying around the star of Jupiter at unequal intervals and periods with wonderful swiftness; which unknown by anyone until this day, the first author detected recently and decided to name Midicean Stars. Venice ...
Chapter 13 - KFUPM Faculty List
Chapter 13 - KFUPM Faculty List

... Q20 The escape speed from a certain planet for an empty spaceship of mass M is 2.0 * 10**4 m/s. What is the escape speed for a fully loaded spaceship which has mass = 3*M ? A1 2.0 * 10**4 m/s. Q21 The gravitational acceleration at the surface of Earth = 9.8 m/s**2. Find the gravitational acceleratio ...
Ch#13 - KFUPM Faculty List
Ch#13 - KFUPM Faculty List

... Q20 The escape speed from a certain planet for an empty spaceship of mass M is 2.0 * 10**4 m/s. What is the escape speed for a fully loaded spaceship which has mass = 3*M ? A1 2.0 * 10**4 m/s. Q21 The gravitational acceleration at the surface of Earth = 9.8 m/s**2. Find the gravitational acceleratio ...
Lecture7_2014
Lecture7_2014

... • UCSC ...
Lec 7 Copernicus I
Lec 7 Copernicus I

... uniform, not with respect to its own geometric centre, but with respect to an equant point displaced from that centre. E.g.: in Fig. 3, P sweeps out equal angles in equal times as measured at Q. Uniformity of angular motion (though not about the centre) retained, but uniformity of linear motion abou ...
Violent Adolescent Planet Caught Infrared Handed
Violent Adolescent Planet Caught Infrared Handed

... of planets. For example, the major impact hypothesis was invoked in order to explain the origin of Earth's Moon, as well as Venus' retrograde rotation, Mercury's small size, and Mars' north-south topographic difference (see, for example, PSRD article: Compositional Balancing before Moon Formation). ...
Document
Document

... are needed to see this picture. ...
3. COMMENTS ON KEPLER`S NEW ASTRONOMY
3. COMMENTS ON KEPLER`S NEW ASTRONOMY

... convincing reasoning than its axiomatic fundamentals. Besides, the same intellectual process will obviously require constituting solids by means of surfaces, surfaces by means of lines, and lines by means of points. Under those conditions, the part of a line will necessarily cease to be a line.}” (A ...
The Stars of Namaqualand
The Stars of Namaqualand

... kilometers are to small for explanations. The typical unit is the light year. Romans had discovered the speed of light in 1675. The light year is the distance which light travels in a vacuum in one year. The sun is about 8 light minutes away from us, because the light from the sun takes 8 minutes to ...
< 1 ... 70 71 72 73 74 75 76 77 78 ... 338 >

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.
  • studyres.com © 2026
  • DMCA
  • Privacy
  • Terms
  • Report