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The mass of an object is a fundamental property of the object; a numerical measure of its inertia; a fundamental measure of the amount of matter in the object. Definitions of mass often seem circular because it is such a fundamental quantity that it is hard to define in terms of something else.
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hyperphysics.phy-astr.gsu.edu/hbase/mass.html
hyperphysics.phy-astr.gsu.edu/hbase/mass.html
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Mass - Wikipedia, the free encyclopedia
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In physics, mass (from Greek ) commonly refers to any of three properties of matter, which have been shown experimentally to be equivalent: inertial mass, active gravitational mass and passive gravi...
en.wikipedia.org/wiki/Mass
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The difference between mass and weight causes a lot of confusion amongst a lot of people. Put simply, weight is a measure of gravity's effect on something. Mass is the amount of matter in an object. Move to a different planet and an object's weight will change, but its mass will be the same.
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education.jlab.org/qa/mass_01.html
education.jlab.org/qa/mass_01.html
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Image right: In this artist depiction of the SWIFT J1756.9-2508 system, the foreground object is the planet-mass object. The pulsar, located at the upper right, is tidally distorting the companion into a teardrop-shaped object, and ripping gas from it.
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www.nasa.gov/centers/goddard/news/topstory/2007/millise...
www.nasa.gov/centers/goddard/news/topstory/2007/millisecond_pulsar.html
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Astronauts on board the Space Shuttle Atlantis explain that both the orbiter and the satellite change positions to keep the same center of mass and that gravity acts to stabilize the orbiter-satellite system. The Center of Mass of an Object: On Land and in Space;
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www.nasa.gov/audience/foreducators/topnav/materials/lis...
www.nasa.gov/audience/foreducators/topnav/materials/listbytype/The_Center_of_Mass_of_an_Object.html
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Greenbelt MD (SPX) Sep 14, 2007 - Using NASA's Swift and Rossi X-ray Timing Explorer (RXTE) satellites, astronomers have discovered one of the most bizarre planet-mass objects ever found. The object's minimum mass is only about 7 times the mass of Jupiter. ... "Given that we don't know the exact mass of either companion,
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www.spacedaily.com/reports/NASA_Astronomers_Find_Bizarr...
www.spacedaily.com/reports/NASA_Astronomers_Find_Bizarre_Planet_Mass_Object_Orbiting_Neutron_Star_999.html
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Excerpts from the Globe's blog on the Boston-area medical community. ... Wait a minute! ... In a letter sent last week to state public health Commissioner John Auerbach, the groups called for a public hearing on the proposal; they said his department should not waive certain clinic requirements for CVS without a hearing and...
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www.boston.com/yourlife/health/other/articles/2007/06/1...
www.boston.com/yourlife/health/other/articles/2007/06/18/mass_health_providers_object_to_drug_store_clinics/
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Using ESO's telescopes, astronomers have discovered an approximately seven-Jupiter-mass companion to an object that is itself only twice as hefty. Both objects have masses similar to those of extra-solar giant planets, but they are not in orbit around a star - instead they appear to circle each other. ... email this story...
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digg.com/space/Astronomers_discover_double_planetary_ma...
digg.com/space/Astronomers_discover_double_planetary_mass_object
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