Penulis Topik: Gravity Probe B (Dibaca 3186 kali)

reborn · « **pada:** April 17, 2007, 03:29:49 AM »

Gravity Probe B is the relativity gyroscope experiment being developed by NASA and Stanford University to test two extraordinary, unverified predictions of Albert Einstein's general theory of relativity.

The experiment will check, very precisely, tiny changes in the direction of spin of four gyroscopes contained in an Earth satellite orbiting at 400-mile altitude directly over the poles. So free are the gyroscopes from disturbance that they will provide an almost perfect space-time reference system. They will measure how space and time are warped by the presence of the Earth, and, more profoundly, how the Earth's rotation drags space-time around with it. These effects, though small for the Earth, have far-reaching implications for the nature of matter and the structure of the Universe.

Berita terakhirnya liat di http://einstein.stanford.edu/

semut-ireng · « **Jawab #1 pada:** September 21, 2011, 10:46:08 AM »

Gravity probe B experiment does not ‘prove Einstein right’

What’s the problem? The statement ‘Einstein proven right’ is deeply problematic for two reasons
1. As Einstein (and later Karl Popper) frequently pointed out, it is a basic tenet of the scientific method that no experiment can ‘prove’ a theory right. An experiment can offer supporting evidence but the case is never closed, because we do not know what new evidence may emerge in the future to cast doubt on other predictions of the theory
2. The constant personalization of the theory of relativity with Einstein creates the impression that the theory depends upon one scientist only, and devalues the work of hundreds of relativists since.
For the above two reasons, most physicists would have framed the result as ‘general relativity passes two important tests’.

http://coraifeartaigh.wordpress.com/2011/05/23/gravity-probe-b-experiment-does-not-prove-einstein-right/

Pi-One · « **Jawab #2 pada:** September 21, 2011, 12:32:15 PM »

Gak bantah teori Einstein, lebih menyorot sisi lain...

ksatriabajuhitam · « **Jawab #3 pada:** September 21, 2011, 07:27:19 PM »

Cormac Rafferty kan sepertinya cuma ga setuju ke judulnya doang,

Kutip

...
However, your headline is problematic for anyone with a knowledge of the scientific method or an interest in the philosophy of science.

In the first instance, it is a fundamental tenet of science that no experiment can ‘prove a theory right’, as Einstein himself (and Karl Popper) frequently acknowledged. Even the most ingenious experiment can only offer evidence in support of a theory –‘right so far’ (and this is leaving aside the difficult question of the interpretation of scientific data). The error is not simply a question of headline shorthand as it is repeated in the opening sentence of the article; ‘..a ..NASA spacecraft has confirmed general relativity’.
...

kalo itu emang saya setuju sama si Comac, cuma bisa membuktikan "right so far". Biasa lah bahasa media mungkin, yang suka hiperbolis.
Rasanya semua sudah tau kalo tidak ada pembuktian total kalau sebuah teori itu benar total, yang ada hanya benar so far.
Seperti eksperimen Huygen yang membuktikan bahwa cahaya ialah gelombang, benar so far;

Tapi kalo secara hasil eksperimen, terbukti bahwa geodetic effect nya memang teramati. dekat malah hasilnya dari ke-empat giroskop dengan perhitungan secara teoritis.

Kutip

Gravity Probe B — Final Experimental Results
Gyroscope   rN-S (Geodetic Measurement)   rW-E (Frame-Dragging Measurement)
Individual Gyroscope Results
Gyroscope #1   -6,588.6±31.7 mas/yr   -41.3±24.6 mas/yr
Gyroscope #2   -6,707.0±64.1 mas/ yr   -16.1±29.7 mas/yr
Gyroscope #3   -6,610.5±43.2 mas/yr   -25.0±12.1 mas/yr
Gyroscope #4   -6,588.7±33.2 mas/yr   -49.3±11.4 mas/yr
Weighted-Average Results for All Four Gyroscopes
All Gyroscopes   -6,601.8±18.3 mas/yr   -37.2±7.2 mas/yr
Schiff-Einstein Predicted Theoretical Values
Theoretical Gyroscope   -6,606.1 mas/yr   -39.2 mas/yr

cantik sekali datanya.

semut-ireng · « **Jawab #4 pada:** September 21, 2011, 09:58:55 PM »

The goal of the GP-B experiment is to measure the geodetic effect to an accuracy of ~0.01%, and to measure the frame-dragging effect, which has not previously been directly measured, to an accuracy ~1%.

http://einstein.stanford.edu/MISSION/mission1.html

“Saya memuji tim Gravity Probe B atas hasilnya, karena Gravity Probe B merupakan eksperimen yang sangat sulit dan indah,” kata Ignazio Ciufolini, seorang fisikawan dari Universitas Salento di Lecce, Italia yang membuat pengukuran yang lebih awal.

http://www.faktailmiah.com/2011/05/17/dua-efek-relativitas-umum-terbukti-oleh-gravity-probe-b.html

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Penulis Topik: Gravity Probe B (Dibaca 3186 kali)

reborn

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semut-ireng

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Pi-One

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ksatriabajuhitam

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semut-ireng

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