What is Galileo: Definition and 49 Discussions

Galileo di Vincenzo Bonaiuti de' Galilei (Italian: [ɡaliˈlɛːo ɡaliˈlɛi]; 15 February 1564 – 8 January 1642) was an Italian astronomer, physicist and engineer, sometimes described as a polymath, from Pisa. Galileo has been called the "father of observational astronomy", the "father of modern physics", the "father of the scientific method", and the "father of modern science".Galileo studied speed and velocity, gravity and free fall, the principle of relativity, inertia, projectile motion and also worked in applied science and technology, describing the properties of pendulums and "hydrostatic balances". He invented the thermoscope and various military compasses, and used the telescope for scientific observations of celestial objects. His contributions to observational astronomy include telescopic confirmation of the phases of Venus, observation of the four largest satellites of Jupiter, observation of Saturn's rings, and analysis of sunspots.
Galileo's championing of Copernican heliocentrism (Earth rotating daily and revolving around the sun) was met with opposition from within the Catholic Church and from some astronomers. The matter was investigated by the Roman Inquisition in 1615, which concluded that heliocentrism was foolish, absurd, and heretical since it contradicted Holy Scripture.Galileo later defended his views in Dialogue Concerning the Two Chief World Systems (1632), which appeared to attack Pope Urban VIII and thus alienated both the Pope and the Jesuits, who had both supported Galileo up until this point. He was tried by the Inquisition, found "vehemently suspect of heresy", and forced to recant. He spent the rest of his life under house arrest. During this time, he wrote Two New Sciences (1638), primarily concerning kinematics and the strength of materials, summarizing work he had done around forty years earlier.

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  1. qnt200

    I Weak principle of equivalence (Galileo, Newton)

    Many tutorials that explain the weak principle of equivalence (Galileo, Newton) do not clearly state whether the body is affected by the force of inertia during free fall as a result of the gravitational acceleration of the body. In other words, the question is whether, during the free fall of a...
  2. G

    Casimir Effect experiment and implications on motion theory

    Quantum mechanics has argued for years that space is not a vacuum. Arguments attempting to brush aside quantum mechanics vacuum theory claiming, it's 'just a quantum mathematical theory' can now put to rest. In this article, laboratory experimentation demonstrates that the Casimir Effect can...
  3. PatrickR

    B Testing the effect of Gravity at home....

    Hi ... air resistance is the reason that objects of different mass fall to Earth at different speeds. In a vacuum all objects fall to Earth at the same rate regardless of mass. OK - I get it but all the experiments that illustrate this tend to rely on tall buildings or massive vacuum chambers...
  4. A

    How did Galileo manufacture his telescope?

    Hi How can a single man without modern technology succeed in manufacturing such an engineering marvel? Galileo wasn't even an engineer he was a scientist. I'm interested to know that because I have always dreamt to invent and manufacture my own products just like Jimmy neutron but found out...
  5. bland

    Science history, falling objects before Galileo

    Aristotle further believed that objects fall at a speed that is proportional to their weight. In other words, if you took a wooden object and a metal object of the same size and dropped them both, the heavier metal object would fall at a proportionally faster speed. link I mean these guys were...
  6. John Mohr

    Would a Very Large Mass (e.g. the Moon) Fall with g?

    Today, I had a thought experiment where I began to puzzle over inertia of very large masses being dropped. Imagine a scenario where the Moon was suspended 100 m from the surface of the Earth alongside a marble at the same height. Now ignoring air resistance and the gravity exerted by the Moon...
  7. T

    If a steel ball were to fall, how far away would it land

    Hello! Imagine you drop a steel ball of weight x from a variable height y. the ball hits a steel ramp on the ground which is at 45 degree's I would like to know how I could work out how far away the ball will land. I have had a good look around for this however the closest thing I can find...
  8. T

    I Galileo's experiment and a lack of understanding....

    Could anyone offer me a little help with understanding why the principles demonstrated in Galileo's (probably fictional, I know) experiment involving two spheres of the same mass from a tower don't apply in the following situation please? As I understand it, the principle is essentially that...
  9. K

    I Galilean transformation paradox help

    I'm getting quite stuck on this problem here. Galileo said that Xb = Xa - V*Ta. (This follows from dv = dx/t --> Xa - Xb = t*dv --> the above formula) Thus, it is concluded Xa = Xb + V*Ta, but why? In my thought experiment the objects are moving relative to each other, thus if A is moving away...
  10. Physics Footnotes

    The World’s Largest Vacuum Chamber Settles an Old Question

    Recently I came across an excellent video that brings to life an age-old physics teaching theme... The world’s largest vacuum chamber is NASA’s Space Power Facility in Ohio, pictured below. They remove around 30 tons of air from the chamber in order to test equipment during in-space conditions...
  11. A

    Geocentric model: how long was it taught in universities?

    I have a historical question which I'm not finding any reference for. I recall how my former professor of history of science told us that the geocentric model was still taught for about a century in the accademia, long after Galileo's discovery of the phases of Venus and long after the...
  12. cnh1995

    IoT and Intel Galileo gen 2

    I have completed a small project on power analysis using Intel galileo board and arduino IDE. The output is displayed on the serial monitor. Now I want to put the data on dweet.io , as IoT. How should I proceed? I have used ubuntu OS for running arduino. Could anyone give me the step-wise...
  13. cnh1995

    Creating a GUI for AC Circuit Analysis with Intel Galileo and Arduino

    I have completed a small project of ac circuit analysis on intel galileo in arduino. I want to make a GUI now. How should I proceed? I know C and a little C++.
  14. TheExibo

    How was Galileo able to observe Venus's phases?

    Another piece of compelling evidence of the existence of a heliocentric solar system was the discovery of Venus's phases by Galileo Galilei. How was Galileo able to observe these phases with the Sun in the way? Did he simply view only early waxing and late waning phases? I find it questioning...
  15. cnh1995

    ADC on Intel Galileo gen 2

    I am working on a little project with intel galileo gen 2 which involves successive analog voltage readings of a sinusoidal waveform. I am using analogRead() function in Arduino IDE for that purpose. But the on-board ADC is extremely slow.The sampling rate I am getting is terribly small which is...
  16. cnh1995

    Solve AC Circuit Analysis Issues with Intel Galileo Gen2

    I am doing a little project with Galileo gen2 about ac circuit analysis in terms of voltage, current, frequency, power and pf. I am using arduino for programming,which is in embedded C. I am facing some problems. Please help me out.. 1. While writing program for frequency, I counted the time lag...
  17. cnh1995

    Intel Galileo Gen 2 & IOT Workshop: Prerequisites for EE Students

    I posted this in the 'programming and CS' section yesterday, but haven't received any reply yet. Maybe some EE people could help.I'm a second year electrical engineering student and I want to work on Intel Galileo Gen 2 for a project. I'm going to attend a workshop on IGG2 and IOT. What do I...
  18. cnh1995

    Intel Galileo Gen 2 & IOT Workshop: Electrical Eng Student Prerequisites

    I'm a second year electrical engineering student and I want to work on Intel Galileo Gen 2 for a project. I'm going to attend a workshop on IGG2 and IOT. What do I need to know as prerequisite? I know C programming and a little embedded C..This whole thing is really cool but I'm afraid I...
  19. K

    Galileo Galileis binocular

    Homework Statement 2009 it was 400 years ago, Galileo Galilei (1564-1642) for the first time turned his home-built telescope to the sky, and for this reason is celebrated this year the International Year of Astronomy a group of astronomers, optical engineers and teachers developed a Galilean...
  20. KL7AJ

    Galileo and Newton: Close is Good Enough for Discoveries

    One of the many earth-shattering discoveries Galileo made (after lots of rumination, I've concluded he's a tie with Newton as my favorite all time smart guy)...was the fact that a pendulum's period is independent of its excursion. Actually, this is true only for small levels of swing, as what...
  21. A

    A basic question about free fall (concerning Galileo and Aristotle)

    This question is from Resnick, Halliday, Krane; Physics 5th edition. This is not actually a homework problem rather a question and so I hope it's not inappropriate to post it here. If m is a light stone and M is a heavy one, according to Aristotle M should fall fall faster than m. Galileo...
  22. L

    What Pope wanted Galileo to include in his book

    Hi, It is often said one of the conditions Pope Urban III granted Galileo permission to write a book expressing his ideas on the solar system was that Galileo would include a paragraph written by the Pope on God's omnipotence. I have been trying unsuccessfully to locate this in a copy of "...
  23. T

    Galileo and a rotating earth

    Galileo tried to convince church leaders of the correctness of the Copernican Theory. He had difficulties because the leading thinkers of his day couldn't believe in the rotation of the Earth on its axis. They thought that a spinning Earth would be easily felt and the Earth must be stationary...
  24. G

    Why was Galileo unable to defend himself?

    Galileo was convicted of heresy and blasphemy for his heliocentric model. However, during the trial, wouldn't Galileo be able to provide experimental evidence and physical proof that would vindicate him?
  25. A

    Galileo and the centripetal force experienced by objects on the rotating earth

    Hi, This question is about a discussion in the two chief world systems, the second day about p 230 in the modern science library edition (around figures 10 and 11). I haven't found the excerpt online so I hope someone has the book. As an objection to a rotating earth, the claim that any...
  26. T

    Galileo, inclined plane and geometry.

    Homework Statement Galileo in seeking to discover the laws governing the motion of bodies under the action of their weight, conducted a series of experiments on inclined planes. Choosing as unit of length the distance traveled by the ball the first unit of time, measuring at subsequent time...
  27. K

    Was Galileo really Italian?

    I’m going to open a new thread with the following thought because, though it is response to something asserted on another thread, it is actually somewhat off topic. So, it is being asserted on another thread that Galileo, surely one of the great heroes of this particular website, was Italian...
  28. Z

    Questions about Galileo statement?

    Galileo was first to demonstrate that in the absence of air, all things would truly fall with the same acceleration and 300 years later demonstrated this by the crew of Apollo-15 on the lunar surface (which has gravity & also lacks air) by dropping a hammer and a feather. As moon was seen...
  29. DaveC426913

    Stargazing First telescope - Galileo?

    Many stories (including most internet accountings) tell of Galileo using the first telescope to look a the stars in 1609. Some reports suggest it was used earlier. What is the accepted truth re: first use of a telescope to view the stars?
  30. U

    Studying for Intro Astronomy Exam: Galileo & Star Spectral Class

    Hello All, I am studying for my introductory astronomy exam and I came about these two question; Galileo discovered a) radioactivity b) some moons of saturn c) 2 moon of Mars d) some moons of Jupiter e) the telescope I know he discovered 4 moons of Jupiter but "some" is a bit...
  31. D

    Was Galileo, Kepler, or Newton more important?

    Hi, I have to pick one of these great scientists to write a middterm item on, so basically I'm curious about what you personally think would be the easiest answer to argue to this question: Which out of Galileo, Kepler or Newton was of the greatest significance in changing the scientific...
  32. Y

    Galileo and Lorentz transformation

    Though I believe I have understood some basic ideas, theories and mathematic formulas of SR, I still have a pretty fundamental question: Many textbooks start SR with a light clock consisting of two mirrors and a light blip bouncing in between, claiming that when the light clock moves, the...
  33. D

    Could Galileo have discovered Sepcial Relativity?

    I have read that if Galileo had included rotational symmetries in his original relativity theorems then a constant turns up in the mathematics. It is the same constant that Einstein concluded was the velocity of light, but has nothing directly to do with light, it just happens that light travels...
  34. G

    Recommended Book by Galileo?

    What book of Galileo, in its original Italian, would you recommend an Italian and physics student read? His Dialogue Concerning the Two Chief World Systems (Dialogo sopra i due massimi sistemi del mondo) seems to be only historically relevant whereas his The Assayer (Il Saggiatore) appears more...
  35. P

    Why the Galileo transformations are not correct for inertial systems

    Why the Galileo transformations are not correct for inertial systems which are traveling close to the speed of light? What made Lorentz to correct this?
  36. Y

    Long planet and Galileo thought experiment

    A long time ago, Galileo stated the vertical motion of a falling body is not influenced by its horizontal motion. Is that still true in moderns terms, taking relativity into account? For example, if a particle is fired horizontally at 0.8c, will it hit the ground at the same time as a...
  37. K

    Looking For Comprehensive Works on the Lives of Copernicus and Galileo

    I'm in need of some help here regarding works on the lives and thought of Copernicus and Galileo. Specifically I'm looking for books that would survey each of their contributions to science while also devoting a similar amount of time to how each of them influenced scientific inquiry at that...
  38. I

    Was Galileo Galilei the first real physicist?

    Was Galileo Galilei the first "real" physicist? Before Galileo, I don't think there was physics in the way we think of it today. It seemed that physics was more of a philosophy to the Greeks and Romans, who just came up with theories and didn't try to prove them through experiment. In my...
  39. S

    Galileo's Pendulum Timer Invention

    Hi All ! What is the name of the mechine invented by Galileo to measure the time period of a pendulum?
  40. B

    Galileo's Relativity: Theory of Clocks Synced by Signal?

    Is it correct to say that Galileo's relativity is a theory with clocks synchronized by a signal that propagates with infinite speed? sine ira et studio
  41. F

    Speed of Light and Galileo

    I'm having trouble with a proble I'm trying to complete. The Problem states: Galileo attempted to measure the speed of light by measuring the time elapsed between his opening a lantern and his seeing the light return from his assistant's lantern. The experiment is illustrated in Figure...
  42. D

    Assignment about Galileo and his contributions to science

    hi I am doing an assignment on Galileo in which i have to disscuss and evaluate this quotation: "One of Galileo's greatest contributions to science was the establishment of the scientific method-that is investigation through experiment" Ive done some stuff on the scientific method but i also...
  43. K

    Galileo & Newton: Dynamics, Laws of Motion, Universal Gravitation

    I am writing an essay on why Galileo's work was important to the development of dynamics, with particular reference to its importance to the development of Newton's Laws of Motion and the Law of Universal Gravition. I've researched some of the stuff that Galileo did: ie. rolling balls down...
  44. Lrdmora

    Temperature Gauge - Galileo

    Okay, this is not for homework, just curious. I was at a friends this weekend and he had a Galileo temperature gauge. I was trying to figure it out. It is full of glass bubbles that are half full of liquid, some small, some large, with glass weights at the bottom and markers. As the...
  45. marcus

    Galileo mission fact sheets (in case yr interested)

    this 9-page NASA fact sheet about the circa 1995-2003 Galileo mission at Jupiter is pretty informative http://www.jpl.nasa.gov/news/fact_sheets/galileo0309.pdf also there's this longer document with several chapters here are links to chapters 6 and 8 Chapter 6 has a diagram of...
  46. Greg Bernhardt

    Remembering Galileo: The Little Spaceship That Could | PhysicsPost

    With all that happened to Galileo on its mission to Jupiter, it becomes difficult not to personify it as The Little Spaceship That Could. For NASA’s Galileo spacecraft kept on going and going... http://physicspost.com/articles.php?articleId=180 [Broken]
  47. P

    Goodbye, Galileo: NASA's Historic Jupiter Mission Comes to an End

    On Sunday afternoon, September 21, 2003, the Galileo spacecraft was plunged into Jupiter at over 100,000 miles per hour, thereby ending one of NASA’s most successful planetary missions yet. http://www.space.com/scienceastronomy/galileo_finale_030921.html [Broken]...
  48. Ivan Seeking

    Crash into Jupiter with Galileo

  49. K

    Galileo Galilei Illuminates

    I have read that the first real scientists as Galileo Galilei were forced by catholic church to found secret society named ILLUMINATES. They was branded as Satanists by Vatican and their scientifical experiments as Dark rituals. They have allegedly infiltrated into Mason´s community, especially...