• 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
The Cosmic Perspective Other Planetary Systems: The New Science
The Cosmic Perspective Other Planetary Systems: The New Science

ExTRaSOLaR pLaNeTS
ExTRaSOLaR pLaNeTS

Chapter 6 Physics
Chapter 6 Physics

... 13. Calculate the gravitational potential energy of the Sun-Earth system. 14. Determine the escape speeds from (a) Mercury (b) Earth’s Moon 15. A neutron star results from the death of a star about 10 times as massive as the Sun. Composed of tightly packed neutrons, it is small and extremely dense. ...
Practice Midterm 1
Practice Midterm 1

... A) Its mass is infinite. B) Its mass is greater than its rest mass. C) Its mass is the same as it would be if it were not moving. D) Its mass is less than its rest mass. 20. How would the passengers on the spaceship view our clocks? A) Time is the same for everyone. B) Our clocks are going fast. C) ...
Physics 2028: Great Ideas in Science: The Exobiology
Physics 2028: Great Ideas in Science: The Exobiology

... viii) In lower mass objects in the Solar System (e.g., asteroids and comets), their gravitational fields were not strong enough for this differentiation to occurs. hence the platinum group elements are evenly distributed through the interior of these objects. ix) ...
Planets Which of the following lists the outer planets
Planets Which of the following lists the outer planets

... 17 hours, approximately. Which of the following could be observed from the planet Uranus? A. Season cycle of 84 years near the poles. B. One sunrise every 17 hours on the equator. C. Days lasting several years near the pole tipped toward the Sun. D. Nights lasting several years near the pole tipped ...
1. Base your answer to the following question
1. Base your answer to the following question

... (1) the distance traveled by light in one year (2) the time it takes light to travel one year (3) the time it takes light to go once around the Earth's orbit (4) the distance the Earth moves in one year ...
Lecture #4 - History of Astronomy - Ptolemy to Kepler
Lecture #4 - History of Astronomy - Ptolemy to Kepler

What is the biggest planet in the solar system?
What is the biggest planet in the solar system?

... of a core is also supported by models of planetary Jupiter also has an array of Irregular Satellites, formation that indicate how a rocky or icy core which are substantially smaller and have more would have been necessary at some point in the distant and eccentric orbits than the others. These plane ...
Stars - Mc Guckin Science
Stars - Mc Guckin Science

... so tightly that its atoms are compacted into a dense shell of neutrons. • If the remaining mass of the star is more than about three times that of the Sun, it will collapse so completely that it will literally disappear from the universe. • What is left behind is an intense region of gravity called ...
ppt
ppt

... protoplanet) building larger, a few 1000 km size objects (Moon-size), the protoplanets. Last stage The few dozens protoplanets on a ~108 (protoplanet→ million year timescale undergo giant planet) impacts resulting in a few terrestrial planets on well-spaced, nearly circular and low inclined orbits ...
Practice questions for Stars File
Practice questions for Stars File

... 1. Describe the difference in the stages of the life cycle for a large and massive star compared to an average star 2. Describe the fuel use changes from birth to death for a black hole 3. Describe the fuel use changes from birth to death for a neutron star 4. Explain how the energy changes are invo ...
- Scholieren.com
- Scholieren.com

... Dwarf planets are a category of solar system bodies created by the International Astronomical Union in 2006 to describe objects orbiting the Sun that are big and heavy enough to resemble a planet, but not big enough to 'clear' a free path on its orbit. What is the difference between an inner and an ...
Unit 1
Unit 1

... materials when different degrees of heat are applied to them, such as melting ice or ice cream, boiling water or an egg, or freezing water. ...
RMH_Stellar_Evolution_Ast2001_09_29_09
RMH_Stellar_Evolution_Ast2001_09_29_09

... He -> C,O , C,O ->heavier elements up to Fe, as a red supergiant or successive transits across HR diagram ...
CHP 19
CHP 19

... e. collisions with large planetesimals. If the terrestrial planets formed by homogeneous accretion, then a. they formed an iron core first and a silicate crust later. b. the solar nebula changed during their fragmentation. c. Earth's original atmosphere was rich in hydrogen. d. the terrestrial plane ...
Everything from Velocity, Seasons, Tides
Everything from Velocity, Seasons, Tides

... Sun, it can never appear to be  far away from the Sun in the  sky.  We can’t see it in the day  because Sunlight blocks it out,  but we can see it as the Sun  either sets or rises Mercury behaves the same  way, but Venus is much brighter ...
File - Joo Eon Park`s Portfolio
File - Joo Eon Park`s Portfolio

... The five known dwarf planets are, Pluto, Eris, Ceres, Makemake, and Haumea. In 1930, Pluto was considered to be the ninth planet in the Solar System. However, in 2006, the International Astronomical Union decided that Pluto, Eris, and Ceres were dwarf planets. A dwarf planet is a celestial body that ...
The Solar System
The Solar System

... closest stars to us, Proxima and Alpha Centauri, are 40 trillion kilometers away. In order, from the Sun: Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune [Pluto has been reclassified as a “dwarf planet.”] Earth is unique among the planets because it is the only one known to support life (and ...
Presentation
Presentation

... To distinguish this planet glow from that of the fiery hot stars, the astronomers used a simple trick. First, they used Spitzer to collect the total infrared light from both the stars and planets. Then, when the planets dipped behind the stars as part of their regular orbit, the astronomers measured ...
Life on Other Worlds
Life on Other Worlds

... e. collisions with large planetesimals. If the terrestrial planets formed by homogeneous accretion, then a. they formed an iron core first and a silicate crust later. b. the solar nebula changed during their fragmentation. c. Earth's original atmosphere was rich in hydrogen. d. the terrestrial plane ...
Renaissance Astronomy
Renaissance Astronomy

... Why were there no telescopes prior to 1600? Consider the following passage, from the Opus Majus of Roger Bacon (1267): “Greater things than these may be performed by refracted vision. For it is is easy to understand by the canons above mentioned that the greatest things may appear exceeding small, ...
Greek Astronomy - Galileo and Einstein
Greek Astronomy - Galileo and Einstein

... Plato, with his belief that the world was constructed with geometric simplicity and elegance, felt certain that the sun, moon and planets, being made of aither, would have a natural circular motion, since that is the simplest uniform motion that repeats itself endlessly, as their motion did. However ...
AP Physics Multiple Choice Practice – Gravitation 1. Each of five
AP Physics Multiple Choice Practice – Gravitation 1. Each of five

... 25. Two artificial satellites, 1 and 2, are put into circular orbit at the same altitude above Earth’s surface. The mass of satellite 2 is twice the mass of satellite 1. If the period of satellite 1 is T, what is the period of satellite 2? (A) T/2 (B) T (C) 2T (D) 4T 26. A planet has a radius one-ha ...
they aren`t just made of ice. They are made from
they aren`t just made of ice. They are made from

... also what makes a shooting star. You ever heard of a shooting star? That’s right! It’s that flash of light you sometimes see at night streaking across the sky. So I want you all to close your eyes and when I say open them I will have a shooting star in my hand. Ready? Close your eyes. (Take one grai ...
< 1 ... 120 121 122 123 124 125 126 127 128 ... 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