How is the mass of the Earth or the Sun measured?

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Discussion Overview

The discussion centers around the measurement of the mass of the Earth and the Sun, questioning the methods used to determine these values and the reliability of scientific claims regarding them. The scope includes conceptual understanding and the application of scientific methodology in measuring large celestial bodies.

Discussion Character

  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant questions the validity of scientific claims about the mass of the Earth and the Sun, suggesting a distrust in the accuracy of these measurements.
  • Another participant defends the scientific method, stating that while scientists may err, science itself does not lie and emphasizes the importance of assuming good faith in discussions.
  • A method for measuring the mass of solar system bodies is mentioned, involving the study of orbits and the gravitational constant ##G##, which is noted to have uncertainty beyond a few significant digits.
  • Several posts diverge into a discussion about the availability and functionality of scales in supermarkets, which appears to be a humorous tangent rather than directly related to the original question.

Areas of Agreement / Disagreement

Participants express differing views on the trustworthiness of scientific measurements, with some defending the scientific method while others express skepticism. The discussion remains unresolved regarding the initial question about the mass of the Earth and the Sun.

Contextual Notes

The discussion includes a mix of serious inquiry and light-hearted commentary, which may distract from the core scientific question. The uncertainty in the measurement of the gravitational constant ##G## is acknowledged but not fully explored.

C18
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TL;DR
Hello , I read the earth and the sun has a mass and google etc gives a measure . When I go the supermarket and buy 1 kg of bananas , they are weighed on scales .

Is science lying about the mass of the earth and the sun ?
Hello , I read the earth and the sun has a mass and google etc gives a measure . When I go the supermarket and buy 1 kg of bananas , they are weighed on scales .

Is science lying about the mass of the earth and the sun ?
 
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C18 said:
Is science lying about the mass of the earth and the sun ?
No. Science is a methodology - it doesn't lie. Scientists might lie, but not in this case. And you'll generally get politer and more helpful answers (from anybody about anything) by at least pretending to assume good faith until shown reasons to think otherwise. Opening up with accusations of dishonesty always makes you look like an arrogant fool, and especially so when they're unfounded.

You can measure the product ##GM## for solar system bodies by studying orbits, and we know ##G## from the Cavendish experiment. Hence we can measure masses of planets and stars. ##G## is our least precisely known physical constant, though, so anything beyond the fourth or fifth digit of such masses is uncertain.
 
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C18 said:
TL;DR Summary: Hello , I read the earth and the sun has a mass and google etc gives a measure . When I go the supermarket and buy 1 kg of bananas , they are weighed on scales .
There are no scales at my local supermarket. If bananas are prepackaged you just have to trust they are the right weight. I usually buy loose bananas, which are priced individually- about 16p each - as I can't get through a whole kg before they've go soft and black.
 
PeroK said:
There are no scales at my local supermarket.
Mine has scales, but apparently "out of order" signs are cheaper than maintenance.
 
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PeroK said:
There are no scales at my local supermarket.
Interesting; in the US, at least at every supermarket ive seen, every checkout counter/barcode scanner is a scale.
 
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Thread closed for moderation.
 
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The OP has been escorted from the building, so this thread will remain closed.
 
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