Space Chapter 7 Glossary Terms

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Author:
EricSchiebel
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253127
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Space Chapter 7 Glossary Terms
Updated:
2013-12-14 14:07:56
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Space Unit
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Glossary Terms for Chapter 7 ScienceON9
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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 isĀ 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 9.5x1012 km
  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
    - the big dippers two end stars are called the pointer stars because they point towards Polaris (north star)
  10. Circumpolar
    - Constellations that are visible year long
  11. Zenith
    - The constellations that you would see if you looked straight up
  12. Tides
    - the rising and falling of ocean waters as a result of the Moons gravity and Earths gravity
  13. Phases of the Moon
    - the monthly progression of changes in the appearance of the Moon, which result from different portions of the Moons sunlit side being visible from Earth
  14. Lunar Eclipse
    - the phenomenon in which the full moon passes into Earths shadow
  15. Solar Eclipse
    - the phenomenon in which the shadow of the Moon falls on Earths surface
  16. Why do we have seasons
    - Because of the Earths revolution around the sun and the rotation around its axis. The earth rotates on a 23.5 degree tilt from the flat plane of the earths orbit. In the summer months, the northern hemisphere is tilted toward the sun and in the winter it is tilted away from the sun. Sunlight strikes the earths surface at different angles and the more direct the angle the more concentrated the sunlight.
  17. Planet
    - an object that orbits one or more stars (and is not a star itself) is spherical, and does not 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
  20. Astronomical Unit
    - the average distance between the Earth and the Sun about 150x106 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 travelling 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 Kuiper Belt and Oort Cloud
  25. Asteroid
    - a small object in size from a tiny speck, like a grain of sand, 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 Earths atmosphere and burns up
  28. Meteorite
    - a meteoroid that is large enough to pass through Earths 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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