Space Chapter 7

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  1. Celestial object
    An object that exists in space. i.e. Moon, Sun, Planets
  2. Astronomer
    A scientist that studies astronomy and space
  3. Revolution
    The time it takes for an object to orbit another object
  4. Rotation
    • The turning of an object around an imaginary axis
    • Earth's rotation around it's axis is 24h
  5. Constellation
    A group of stars that make a distinct image or pattern. i.e. Orion
  6. Light-year
    The distance it takes for light to travel in a year. 9.5 x 10^12
  7. Apparent Magnitude
    The brightness of a star as seen on Earth.
  8. Asterism
    • A small group of stars inside constellations that form patters.
    • It is not a constellation but instead inside of it.
  9. Pointer Star
    • The two stars on the Big Dipper which when followed lead to the North Star or Polaris
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  10. Circumpolar
    • They are constellations that can be seen all year
    • This is due to them being situated on the Earth's poles
  11. Zenith
    It is the constellation that you would see when you look straight up
  12. Tides
    • It is the rising and falling of ocean water due to the Moon's Gravitational Pull
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  13. Phases of the moon
    • The monthly change of the Moon appearance.
    • Caused by different portions of the moon that is lit by the sunImage Upload
  14. Lunar Eclipse
    • When a full Moon is covered by the Earth's Shadow when passing though it
    • The moon is in the umbra portion of the Earth. 
    • This phenomenon is completely safe to watch
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  15. Solar Eclipse
    • When the shadow of the moon falls on the Earth's surface
    • When a new moon is blocking the sun 
    • The sun's UV radiation can still leak out around the edges and is more dangerous than staring at the sun
    • Image Upload
  16. Why do we have Seasons?
    • The reason why we have season is because the earth is on a 23.5 degree tilt. 
    • In the summer the northern hemisphere is tilted towards the Sun and in the Winter it's the opposite.
    • Because of the tilt sunlight hits the Earth at different angles. Areas with a larger angle receive more sunlight for longer periods of time.
    • Places near the equator are warmer because the light is more concentrated when it is head on.
    • Image Upload
    • The winter solstice is the shortest day and longest night and June 22 is the longest day and the shortest nigh
  17. Planets
    • An object that orbits around a star, spherical, and does not share an orbit with another.
    • The inner planets are Mercury, Venus, Earth, and Mars. They are then seperated by an asteroid field. Then the outer planets are Jupiter, Saturn, Uranus, and Neptune.
  18. Solar System
    • A group of planets that circle around one or more stars
    • Image Upload
  19. Retrograde Motion
    • The movement of an object usually a planet that goes west to east  instead of it's usual east to west.
    • This is generally caused when Earth is passing that planet in it's orbit.
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  20. Astronomical Units
    • The average distance from the sun to Earth
    • 150 x 10^6
  21. Orbital Radius
    The average distance between the Sun and an object orbiting around it.
  22. Geocentric Model
    A model of the Solar System where the Earth is in the center and all the planets orbit around it in perfect circles
  23. Heliocentric Model
    The model where all the planets orbit around the sun
  24. Comet
    • An object composed of rocky material, ice and gas. 
    • It comes from the Kuiper Belt or Oort Cloud
    • When it gets close to the sun the
  25. Asteroid
    Any object in space whether a speck of dust or a 500km wide rock
  26. Meteoroid
    A piece of rock moving through space
  27. Meteor
    A meteoroid that entered the Earth's atmosphere and burned up.
  28. Meteorite
    A meteoroid big enough to enter the Earth's atmosphere and reach ground without be burned up completely
  29. Mercury
    Covered in craters, close in size to the moon, no atmosphere so extreme temperature differences.
  30. Venus
    shrouded in thick clouds, sister planet to earth, acid rain(sulfuric), nitrogen and carbon dioxide in the atmosphere, hotter than mercury because atmosphere traps heat
  31. Earth
    has life, has water in three phases, water covers nearly 3/4 of surface, nitrogen oxygen and water vapor in atmosphere
  32. Mars
    Iron makes surface red, tall volcano (3x Mont Everest, 900 km/h winds, 2 polar ice caps,thin atmosphere, carbon dioxide.
  33. Jupiter
    largest planet, Great Red Spot is a giant storm in clouds, thin ice rings, helium and hydrogen, shortest day.
  34. Saturn
    rings made of ice particles that range in size, hydrogen and helium.
  35. Uranus
    methane in atmosphere gives blue/green colour, helium and hydrogen, rotation on its side, 4th biggest.
  36. Neptune
    Thin ice rings, hydrogen and helium, outermost planet, 3rd biggest.
  37. Trans-Neptunian object
    • Any object that orbits the sun outside of Jupiter
    • i.e. Kuiper's Belt, Oort Cloud, Pluto...
Author:
HuckKim
ID:
313747
Card Set:
Space Chapter 7
Updated:
2016-01-17 03:56:58
Tags:
Science astronomy
Folders:
science,space,astronomy
Description:
Ms. Day's Gr 9 science class
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