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  • Where did the Moon come from? - NASA
    The relative abundance of oxygen isotopes on Earth and on the Moon are identical, which suggests that the Earth and Moon formed at the same distance from the Sun Various theories had been proposed for the formation of the Moon Below these theories are listed along with the reasons they have since been discounted
  • StarChild: The Moon - NASA
    One theory states that the debris from the impact was hurtled into space where, due to gravity, it combined This resulted in the formation of the Moon The gravitational pull of the Moon on the Earth affects the ocean tides on Earth The closer the Moon is to Earth, the greater the effect The time between high tides is about 12 hours and 25
  • StarChild: Facts about the Moon - NASA
    The StarChild site is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), within the Astrophysics Science Division (ASD) at NASA GSFC StarChild Authors: The StarChild Team StarChild Graphics Music: Acknowledgments StarChild Project Leader: Dr Laura A Whitlock Curator: J D Myers Responsible NASA Official: Amber Straughn
  • The Phases of the Moon - NASA
    The phase of the Moon, or the shape of the lit part of it, that we see at any time is then determined by the combination of these two factors - which part of the Moon is lit by the Sun and to Earth at the same time!
  • What are the phases of the Moon? - NASA
    The Moon orbits Earth at an average distance of 382,400 kilometers The lunar month is the 29 53 days it takes to go from one new moon to the next During the lunar month, the Moon goes through all its phases You can see the phases drawn in the image below Just like the Earth, half of the Moon is lit by the Sun while the other half is in
  • StarChild: A Learning Center for Young Astronomers - NASA
    StarChild is a learning center for young astronomers ages 5-13 to learn about the solar system, the Milky Way galaxy, and the universe beyond Use the links above to explore the site's topics If you are looking for something a bit more advanced (ages 14+), then head on over to Imagine the Universe!
  • 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 dust These clouds are called nebulae, and it is in a nebula where stars are born In the nebula is hydrogen gas which is pulled together by gravity and starts to spin faster Over millions of
  • Why is there day and night? - NASA
    StarChild Question of the Month for March 2001 Question: Why is there day and night? Answer: Clearly, when you see the Sun shining in the sky, it is day, and when you don't it is night So the real question is "why is the Sun in the sky at some times and not at others?" We can see that the Sun seems to move across the sky starting in the east in the morning, moving toward the south at noon
  • 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 closest to the Sun, are solid spheres of rock and include Mercury, Venus, Earth, and Mars The inner planets were constantly bombarded by and during their first 600 million years in
  • StarChild: The Solar System - NASA
    The words " solar system " refer to the Sun and all of the objects that travel around it These objects include planets, natural satellites such as the Moon, the asteroid belt, comets, and meteoroids Our solar system has an elliptical shape and is part of a galaxy known as the Milky Way The Sun is the center of the solar system It contains 99 8% of all of the mass in our solar system





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