• 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
Document
Document

... •The presence of the decay products of 26Al (which has a half-life of 3 x 106 yrs) in meteorides indicates that the time period between this element being ejected from a nearby star (where it would have had to have been produced) into what would have become the pre-solar nebula, and for it then to c ...
Midterm Study Guide
Midterm Study Guide

... 63. What is the difference between a covalent and ionic bond? 64. What are 4 processes that form minerals? ...
Orbits…the celestial paths of planets
Orbits…the celestial paths of planets

... Planetary data (I love tables with data) Kepler’s 3rd Law: the harmonic law. The semimajor axis of an orbit, and the orbital period are not independent. They are related by a simple equation. A3=P2 ...
Orbits…the celestial paths of planets
Orbits…the celestial paths of planets

... Kepler’s 3rd Law: the harmonic law. The semimajor axis of an orbit, and the orbital period are not independent. They are related by a simple equation. A3=P2 ...
Name
Name

... This is a pre-test on Astronomy meant to assess what you know about Astronomy before our unit begins. Choose the best answer for each question and circle it. Don’t worry about questions you don’t know, try to reason through it. 1. Why does the moon appear to move across the sky during the night? a. ...
The Milky Way
The Milky Way

... differences between terrestrial and Jovian planets? a. The temperature of the accretion disk was high close to the Sun and low far from the Sun. b. Terrestrial planets formed closer to the Sun, and are thus made of high-density rocky materials. c. Jovian planets are large and have high-mass because ...
Ellipses
Ellipses

... would create a circular orbit. If there’s more than one massive celestial body, the orbiting object will have have an eccentric or elliptical orbit. This has many consequences, not on how we observe space but also how navigate it. Other than the threat of running into random objects, gravity is one ...


... 36. The theoretical basis of rocket propulsion is based on Newton’s ? Law of Motion. A.first B.second C.third 37. The distance a ball travels is proportional to the square of the time that it has been in motion. This mathematical relationship was first defined by A.Newton B.Copernicus C.Kepler D.Gal ...
P101.EXAM1.931.v2 - KFUPM Faculty List
P101.EXAM1.931.v2 - KFUPM Faculty List

... 20) At what percentage of speed of light (c) should a spacecraft move so that a round trip to Proxima Centauri stellar system takes 50 years, if it is at a distance of 1.3 pc? ...
Exploring the Solar System - Rourke Publishing eBook Delivery
Exploring the Solar System - Rourke Publishing eBook Delivery

... DID YOU KNOW? Planets orbit the Sun and rotate on their axes at different rates. Mercury travels quickly around the Sun in just 88 Earth days, but it rotates very slowly. One Mercurian day is 176 Earth days long. It takes Venus 225 Earth days to orbit the Sun, but it rotates very slowly. It takes ...
Chapter8- Jovian Planet Systems
Chapter8- Jovian Planet Systems

... image of Jupiter in true color. ...
Kepler`s Laws, Newton`s Laws, and the Search for New Planets
Kepler`s Laws, Newton`s Laws, and the Search for New Planets

... now know that everything is moving: the entire solar system is circling the galaxy, the whole galaxy is moving with respect to other galaxies, and roughly speaking, “all motion is relative”—and also for the mathematical reason that we can choose coordinates in which anything we like is fixed. Howeve ...
Neptunus
Neptunus

... planet, as it did not follow the predictions. Alexis Bouvard, the director of the Paris Observatory, attempted to calculate improved tables using the latest mathematical techniques, but was unable to fit all the observations, ancient and modern, to a single orbit, and finally decided to rely only on ...
No Spring Picnic on Neptune
No Spring Picnic on Neptune

... sometimes gust to 900 miles per hour. What is remarkable is that Neptune — the farthest and coldest of the major planets — exhibits any evidence of seasonal change. After all, the Sun is 900 times dimmer than it is on Earth (see graphic, page 2, top). A warming trend is on the way So, how can astron ...
Space studies
Space studies

... the night sky, reaching an apparent magnitude of −4.6, bright enough to cast shadows.[12] Because Venus is an inferior planet from Earth, it never appears to venture far from the Sun: its elongation reaches a maximum of 47.8°. Venus reaches its maximum brightness shortly before sunrise or shortly af ...
ph709-15
ph709-15

... Small planets between the sizes of Earth and Neptune substantially outnumber Jupiter-sized planets. Super-Earths with orbital periods less than 100 days are extremely abundant around Sun-like stars. It is unlikely that these planets formed at their current locations. Rather, they likely formed at la ...
PowerPoint Presentation - msharnack
PowerPoint Presentation - msharnack

... http://tcaa.us/Astronomy/Moon.aspx http://planetfacts.org/how-big-is-the-moon-compared-to-earth/ http://science.howstuffworks.com/moon.htm http://www.universetoday.com/20289/phases-of-the-moon/ http://physics.stackexchange.com/questions/1907/why-can-we-see-the-new-moon-at-night https://remnantones.w ...
PHYS 215 - First Major Exam MULTIPLE CHOICE
PHYS 215 - First Major Exam MULTIPLE CHOICE

... 20) At what percentage of speed of light (c) should a spacecraft move so that a round trip to Proxima Centauri stellar system takes 50 years, if it is at a distance of 1.3 pc? ...
Planets - WordPress.com
Planets - WordPress.com

... Pioneer 11 did the first flyby of the planet in 1979. Since then, Voyager 1 was sent closer to Saturn and it took much higher quality photographs. ...
Name
Name

... What is the relationship between the gravitational pull on an object and its period of revolution? (Example, if a planet is experiencing more gravitational pull acting on it from the Sun, will it have a slower or faster period of revolution?) Give an example of this in our solar system. ____________ ...
This Month In Astronomy - Astronomy Club of Virginia Tech
This Month In Astronomy - Astronomy Club of Virginia Tech

... Neptune. The strong influence of Neptune perturbs the orbits of some of these objects and may send them into new orbits aimed at the inner solar system. When this happens, an object is likely to become a short period comet. There are many discovered scattered disk objects. The most notable one is Er ...
Our Solar System Study Guide
Our Solar System Study Guide

... pull, between any two objects. 2) The strength or pull of gravity is affected by the total ______________________ of the objects and by the _______________________________ between them. If you wanted to decrease the pull of gravity between two objects, how would you do it? __________________________ ...
File
File

... large volumes of water exist as buried ice in Mars' polar regions. Evidence suggests that shallow ground ice is likely buried in many other regions of the planet as well. It is possible that liquid water may be found at greater depths below the ice, although none has yet been detected. 23. The order ...
STUDY QUESTIONS #10 The MILKY WAY GALAXY diameter face
STUDY QUESTIONS #10 The MILKY WAY GALAXY diameter face

... 9. Using the rotation curve above, astronomers have calculated a mass for the whole Galaxy, out to about 50,000 light-year radius where there are no more stars, to be about 2 × 1011 M , yet by measuring light at all wavelengths, they only measure one sixth of that mass (3 × 1010 M ). Using the orbit ...
Glossary (PDF file)
Glossary (PDF file)

... flyby A flight close by a planet to collect observations. Many space probes never land. Instead, they make images of planets as they pass by in space. They send the images back to Earth. Computers decode the images. gibbous A phase of the Moon between the full moon and a quarter moon, or between a qua ...
< 1 ... 166 167 168 169 170 171 172 173 174 ... 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