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cc4019

The astronomical object known as Crab Nebula is thhe remnant of an exploded star. The explosion was seen by the Chinese in 1054 C.E. However, the Crab Nebula is about 3500 LY distance from the Earth In what year did the star actually explode.

  • one year ago
  • one year ago

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  1. UnkleRhaukus
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    http://apod.nasa.gov/apod/image/0802/crabmosaic_hst_big.jpg

    • one year ago
  2. cc4019
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    i dont understand why are we including the current year when it was viewed in 1054

    • one year ago
  3. UnkleRhaukus
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    hmm,

    • one year ago
  4. UnkleRhaukus
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    if the crab nebula is 3500 [lyr] away, then light traveling from the crab nebula will take 3500 [yr] to reach earth so to find the year that the light left the crab nebula just take away the travel time from the year it arrived at earth 1054 CE 1054-3500=

    • one year ago
  5. cc4019
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    im here

    • one year ago
  6. cc4019
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    2466

    • one year ago
  7. UnkleRhaukus
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    btw, im not sure where you got the distance to the crab nebula from because i thought it was 6500 lyr (not 3500 lyr)

    • one year ago
  8. cc4019
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    my textbook says its about 3500 LY away

    • one year ago
  9. UnkleRhaukus
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    dont for get that the year will be before 0 CE so it will be ... BCE

    • one year ago
  10. UnkleRhaukus
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    (well i guess you can use that value if its in your book)

    • one year ago
  11. cc4019
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    so what was the first answer you gave because that seemed to make a lot of sense if the speed of light is pretty fast

    • one year ago
  12. UnkleRhaukus
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    \[s=\frac{d}{t}\qquad\implies t=\frac ds\] \[d=3500 [\text{ly}]=3500\times c\times[\text {yr}]\]\[s=c\] \[t=\frac ds=\frac{3500\times c\times[\text {yr}]}{c}=3500 [\text {yr}]\] \[1054[\text{yr}]~C.E.-3500[\text{yr}]=-2446~C.E.=2446~B.C.E\]

    • one year ago
  13. cc4019
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    Ok thank you for your time and explanation.

    • one year ago
  14. UnkleRhaukus
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    sorry about my first post[now deleted] ( i only just woke up)

    • one year ago
  15. cc4019
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    its fine you've helped me understand with the formulas you've provided

    • one year ago
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