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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 › 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 …

  3. 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 …

  4. 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 …

  5. 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 …

  6. 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 …

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

    StarChild: Space Probes - NASA

    Space Probes Some space probes, such as Pioneer 10, fly out of our solar system and never come back. Other space probes, like the Hubble Space Telescope, stay in orbit around the same planet …

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

    StarChild: The Sun - NASA

    The Sun is our closest star. It is a member of the Milky Way galaxy. The Sun is a yellow dwarf star, which means it is a medium size star. It is believed to be over 4 billion years old. The Sun spins …

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

    StarChild: Did you know... (The Sun) - NASA

    The Sun's gravitational pull is so strong that a 100 pound person would weigh 28 times that, or 2800 pounds, on the Sun.

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

    Galileo Galilei - NASA

    Galileo Galilei was an Italian physicist and astronomer. He was born in Pisa on February 15, 1564. Galileo's father, Vincenzo Galilei, was a well-known musician. Vincenzo decided that his son should …

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