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cc4019

  • 2 years ago

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.

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  1. UnkleRhaukus
    • 2 years ago
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    http://apod.nasa.gov/apod/image/0802/crabmosaic_hst_big.jpg

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

  3. UnkleRhaukus
    • 2 years ago
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    hmm,

  4. UnkleRhaukus
    • 2 years ago
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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=

  5. cc4019
    • 2 years ago
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    im here

  6. cc4019
    • 2 years ago
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    2466

  7. UnkleRhaukus
    • 2 years ago
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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)

  8. cc4019
    • 2 years ago
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    my textbook says its about 3500 LY away

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

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

  11. cc4019
    • 2 years ago
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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

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

  13. cc4019
    • 2 years ago
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    Ok thank you for your time and explanation.

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

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

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