the attractive force that one object exerts on another it finally became

The attractive force that one object exerts on

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the attractive force that one object exerts on another it finally became possible to explain the motions of these objectst The Nature of Our Solar System Earth travels 150 million km in 365 days that it takes to complete and orbit this means that our planet races along its orbit at a rate of 107,300 km/h Solar System - the sun, planets, moons, and countless other small objects held together by the “glue” of gravitational attraction Sun accounts for 99.8 percent of mass in the solar system remaining .2 includes a great variety of objects, mostly planets Planet - an object that orbits a star, is spherical, and has “cleared its neighborhood of other objects” planets gravity has pulled in all particles of matter in its orbit 8 planets - not pluto Moon - sizeable body locked in orbit around a planet all but 2 planets have moons many are small and have irregular shapes our solar system is not alone in hosting planets astronomers found “extra solar planets” orbiting stars in many other systems Terrestrial planets - consist of a shell of rock surrounding a ball of metallic iron alloy inner planets mercury venus earth mars closer to the sun relatively small Gas- Giant Planets - most of their mass consists of gas and “ice.” ice is general term that includes the solid state of many materials besides water that could be gaseous under earths conditions outer planets jupiter saturn uranus neptune also called Jovian planets huge jupiters diameter is 11.2 times greater than earths
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force - simple pull or push that causes the velocity or speed of an object to change in magnitude and or direction 2 types of force contact force when one mass moves and comes in contact w another pushing a boulder wind pushing sail non contact or field force gravity and magnetism gravity - force of attraction between 2 masses strength of gravity depends on the quantity of matter in 2 masses magnetism can be attractive or repulsive you can overcome gravity with a magnet Discovering Planets before telescope astronomers recognized mercury venus mars jupiter and saturn they can be seen with the naked eye uranus was found bc of telescope in 1781 discovered that gravity of another planet must have been tugging on it which led to discovery of neptune in 1846 then pluto in 1930 consists of mostly ice not like other planets, smaller orbit does not lie in the same plane kuiper belt millions of icy objects similar in composition to pluto named after astronomer who predicted its existence 2006 changed the definition of a planet pluto and eris are sometimes considered dwarf planets about a trillion dwarf planets eris found in 2003 20% larger than pluto earth is orange, earth is seseme seed 15 meters away all planetary orbits lie roughly in the same plane Stars and Galexies stars - immense balls of incandescent gas in which nuclear fusion reactions produce intense heat and light sun is medium sized star gravity holds stars together in groups called galaxies
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