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The universe is the whole all that it exists. It's consists of planets, comets, stars ......

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Patricia Padi Boyd was born in Perth Amboy , New Jersey. At school , she was very interested in writing , art , ballet and dance , gymnastics and music. During the last years of hight school , she studies astronomy.

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Patricia studied physics at graduate school at Drexel University , became interested in computer modelng of stellar and galactic dynamics. She worked in a astronomy Gama rays group to work on Moxe. This is an experiment expect to pilote on the Russian Spectrum X-Gamma satellite. Now , she works as a USRA contractor for Rossi X-ray Timing Explorer mission.

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She was very fascinated by the spectacular images of galaxies and planets and became a huge fan of Carl Sagan's PBS series Cosmos. She read many books on the astronomy and she realized that she would like to study in astronomy universities. She starded looking for universities with a good astronomy department. She attended Villanova University , in Pennsylvania whom has three observatories .

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Laser Interferometer Gravitational Observatory

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LIGO is a physics experiment that aims to directly detect gravitational waves . LIGO is made of two long pipes 2.5 miles long, in wich a laser produes the purest possible light.

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The tide is a movement returning to the regular interval of sea water or oceans.

What causes this phenomenon ?
The attraction between the Earth and the Moon slightly stretches the Earth and gives to it sort of a rugby foot ball shape with two bulges : one bulge which is on the part facing the Moon and another bulge on the opposite side . Therefore in fact tides are caused by the Moon's gravitationnal face towards the Earth .

How does it work ?
A lot of the Earth is covered in water anx it responds to this attraction and its changements during a day.
Let's explain : when you are on a part of the Earth facing the Moon or on the opposite side, the force will be stronger than if you are not there and the water bulges up when the force is stronger . This is what we call high tides since Earth is rotating , you have during a day two high tides and two low tides.

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Gravitation is the attraction between two bodies which have a mass.

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Properties :
*That gravitation has a direction : from the object towards the Earth's center .
*That gravitation is proportional to the quantity of matter . The attraction works both ways between two objects .

F=(M1XM2)/rXr

For exemple when an apple fall in the floor from the tree and never in any direction .

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Archimedes' thrust is the particular force experienced by a body immersed in whole or in part in a fluid (liquid or gas) subjected to a gravity field.

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Thus, if one considers a cube subjected to the force of gravity Fp and immersed in water, it will undergo a thrust of Archimedes FA of direction opposite to this force of gravity.According to the average density of the cube, for the same volume, the force Fp will not be the same but the force FA will not change.

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Bracket

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Bruette
Fill the bruette with 60 milliters of water...

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suspend an object of 100g to the dynanometer ...

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...and plunge it into the liquid.

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Following the object immersed in the water we notice that the amount of water has increased . It's Archimède's thrust.

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