Chapter 7 glossary terms

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MaximFrumkin
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Chapter 7 glossary terms
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2014-12-16 18:30:20
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SCIENCE glossary terms
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  1. Celestial object
    Any object that exists in space, such as a planet, a star, or the Moon
  2. Astronomer
    A scientist who studies astronomy, which is the study of the night sky
  3. Revolution
    The time it takes for an object to orbit another object; Earth's revolution around the sun is 365.24 days
  4. Rotation
    The turning of an object around an imaginary axis running through it.
  5. Constellation
    A group of stars that seem to form a distinctive pattern in the sky
  6. Light-year
    The distance that light travels in one year, about 9.5*10 to the power of 12
  7. Apparent magnitude
    The brightness of a star as seen from Earth
  8. Asterism
    A smaller group of stars that form patterns within a constellation
  9. Pointer stars
    A group of stars that show the location of another star if you draw an imaginary line through them 
  10. Circumpolar
    Constellations that are visible all year long
  11. Zenith
    The constellations that you would see if you looked straight up
  12. Tides
    Three rising and falling of ocean waters as a result of the Moon's gravity and Earth's gravity
  13. Phases of the Moon
    The monthly progression of changes in the appearance of the Moon, which result from different portions of the Moon's sunlit side being visible from Earth
  14. Lunar eclipse
    • The phenomenon in which the full moon passes into Earth’s shadow
    • is safe to watch  
  15. Solar eclipse
    • The phenomenon in which the shadow of the Moon falls on Earth's surface 
    • is not safe to watch 
  16. Why do we have seasons?
    • In the summer we receive more direct rays of sunlight, so the temperature is higher 
    • in the winter the opposite is true
    • this is because the Earth rotates on an angle 
  17. IPlanet
    • An object that orbits one or more stars (and is not a star itself) is spherical, and doesn’t share its orbit with another object 
  18. Solar system
    A group of planets that circle  one or more stars
  19. Retrograde motion
    • The movement of an object in the sky,  usually a planet, from east to west, rather than in its normal motion from west to east
    • happens when earth passes an outer planet in its orbit.
  20. Astronomical unit
    The average distance between Earth and the Sun, about 150 *10 the power of 6 km
  21. Orbital radius
    The average distance between the Sun and an object that is orbiting the sun
  22. Geocentric model
    A model of the solar system stating that Earth is the centre of all planetary motion, with the planets and the Sun traveling in perfect circles around Earth
  23. Heliocentric model
    A model of the solar system in which the Sun is in the centre with the planets orbiting it
  24. Comet
    An object composed of rocky material, ice, and gas; comes from the Kuipier Belt and Oort Cloud 
  25. Asteroid
    A small object that ranges in size from a tiny speck, to 500 km wide; most asteroids originate in the asteroid belt between Mars and Jupiter 
  26. Meteoroid
    A piece of rock moving through space
  27. Meteor
    A meteoroid  that hits Earth's atmosphere and burns up
  28. Meteorite
    A meteor that is large enough to pass through Earth's atmosphere and reach the ground, without being totally burned up
  29. Trans-Neptunian object
    An object that circles the Sun beyond the orbit of Neptune

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