Astronomy Chapter 7

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nateskeen
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291806
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Astronomy Chapter 7
Updated:
2014-12-16 21:40:49
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astronomy
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  1. Celestial Object
    Celestial objects are naturally occurring physical entities, associations or structures that current science has demonstrated to exist in the observable universe.
  2. Astronomer
    An expert or student or astronomy, observes celestial object.
  3. Revolution
    the action of moving around something in a path that is similar to a circle.
  4. Rotation
    the act of rotating; a turning around as on an  axis.
  5. Constellation
    a group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure.
  6. Light-Year
    a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km
  7. Apparent Magnitude
    the magnitude of a star as it appears to anobserver on the earth.
  8. Asterism
    a prominent pattern or group of stars, typically having a popular name but smaller than a constellation. Can be part of a constellation.
  9. Pointer Stars
    Pointer Stars are stars that are used to pinpoint other areas in the sky, such as constellations or a certain direction.
  10. Circumpolar
    situated around or inhabiting one of the earth's poles.
  11. Zenith
    the point in the sky or celestial sphere directly above an observer.
  12. Tides
    The rising and falling of the earth's oceans caused by the moon's and earth's gravity
  13. Phases of the moon
    First Quarter-Waxing Crescent-New Moon- Waning Crescent-Third Quarter-Wanning Gibbons-Full Moon-Waxing Gibbous
  14. Lunar Eclipse
    The phenomenon in which the full moon passes into Earth's shadow.
  15. Solar Eclipse
    The phenomenon in which the shadow of the Moon falls on Earth's surface
  16. Why do we have seasons?
    We have seasons because the earth is tilted  as it makes its yearly journey around the sun. The Earth's axis is tilted at an angle of 23.5 degrees. This means that the Earth is always "pointing" to one side as it goes around the Sun.
  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 its normal motion from west to east, this effect is generally produced when Earth is passing the planet in its orbit
  20. Astronomical Unit
    The average distance between Earth and the Sun, about 150x10 to the power of 6km
  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 in 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 or Oort Cloud.
  25. Asteroid
    An object in space that ranges 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 Earth's atmosphere and burns up
  28. Meteorite
    A meteoroid 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 Neptune

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