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What is gravity? - NASA Newton's "law" of gravity is a mathematical description of the way bodies are observed to attract one another, based on many scientific experiments and observations The gravitational equation says that the force of gravity is proportional to the product of the two masses (m 1 and m 2), and inversely proportional to the square of the distance (r) between their centers of mass Mathematically
StarChild: Glossary - NASA GRAVITATIONAL PULL See Gravity GRAVITY The force of attraction between two objects which is influenced by the mass of the two objects and the distance between the two objects GYROSCOPE A heavy wheel or disk mounted so that its axis can turn freely in one or more directions A spinning gyroscope tends to resist change in the direction of its axis
StarChild: Stars - NASA Gravity causes the last of the star's matter to collapse inward and compact This is the white dwarf stage which is extremely dense White dwarfs shine with a white hot light but once all of their energy is gone, they die The star has now reached the black dwarf phase
How do we know that dark matter exists? - NASA The cluster does not behave as scientists would expect it to if only the visible matter is generating the gravity present in the cluster 'Dark matter' theory suggests that a huge amount of dark (invisible to direct observation) matter, interacting gravitationally with the normal, visible matter in the universe, exists
Teachers Center Activity: Gravity Effects on Planet Motion - NASA 1 Introduction: Review the definition of gravity Drop a ball and explain why it falls downward Explain that the strength of a gravitational pull is determined by the masses of the objects involved and the distance between the objects Hold up a scale model of Earth and a scale model of the Sun Inquire as to which object would exert a stronger pull
StarChild: Galaxies - NASA A galaxy is a cluster of stars, dust, and gas which is held together by gravity Galaxies are scattered throughout the universe and they vary greatly in size A galaxy may be alone or it may be in a large group of galaxies called a "supercluster" Galaxies are classified by scientists according to their shape and appearance An irregular galaxy has an undefined shape and is full of young stars
What makes stars shine - NASA It is this energy which causes the star to shine and stops it from collapsing due to the pull of gravity Does the conversion of this tiny bit of mass into energy create enough energy to account for the Sun’s output of 390,000,000,000,000,000,000,000,000 Watts?
Sir Isaac Newton - NASA As the years progressed, Newton completed his work on universal , diffraction of light, centrifugal force, centripetal force, inverse-square law, bodies in motion and the variations in tides due to gravity His impressive body of work made him a leader in scientific research
StarChild: Glossary - NASA GRAVITY The invisible force between objects that makes objects attract each other GRAVITATIONAL PULL The attraction that one object has for another object due to the invisible force of gravity H HURRICANE A very, very strong windstorm where the wind blows in circles at more than 46 kilometers per hour Heavy rains often come with the winds I