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  1. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › questions

    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 …

  2. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › planets.html

    StarChild: The Planets and Dwarf Planets - NASA

    The Planets and Dwarf Planets A planet is a large space body which reflects the light of a star around which it . The planets in our are classified as inner planets and outer planets. The inner planets, the …

  3. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › glossary_text.html

    StarChild: Glossary - NASA

    GRAVITATIONAL FORCE See Gravity 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 …

  4. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › asteroids.html

    StarChild: The Asteroid Belt - NASA

    An asteroid is a rocky body in space which may be only a few hundred feet wide or it may be several hundred miles wide. They are considered to be debris left over from the formation of the solar …

  5. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › darkmatter.html

    StarChild: Dark Matter - NASA

    There is no current problem of greater importance to cosmology than that of dark matter. Dark matter is composed of particles that do not absorb, reflect, or emit light, so they cannot be detected by …

  6. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › teachers › gravity_effects.html

    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 …

  7. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › stars.html

    StarChild: Stars - NASA

    A star is a brilliantly glowing sphere of hot gas whose energy is produced by an internal nuclear fusion process. Stars are contained in galaxies. A galaxy contains not only stars, but clouds of gas and …

  8. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › planets.html

    StarChild: The Planets and Dwarf Planets - NASA

    Listen to an audio version of this page. A planet is a large space object which revolves around a star. It also reflects that star's light. Eight planets have been discovered in our solar system. Mercury, …

  9. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › asteroids.html

    StarChild: The Asteroid Belt - NASA

    An asteroid is a bit of rock. It can be thought of as what was "left over" after the Sun and all the planets were formed. Most of the asteroids in our solar system can be found orbiting the Sun between the …

  10. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › questions

    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 …