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Originally posted by cheshirecatstevensPerhaps i am mistaken but this is one of those "looks hard but actually quite easy" problems.
The apparent expansion rate a nebula is 0.43 arcsec per year. The apparent size of the nebula is about 4 by 5.7 arcmin. If the expansion rate remains constant, calculate how long it will be until the long axis of the nebula has the same apparent size as the full moon (0.50 degree or 1800 arcsec).
60 arcsec = 1 arc min
We want long axis of apparent size of nebula to span 1800 arcsec, it currently spans 5.7*60 = 342 arcsec
Therefore apparent size of nebula needs to grow 1800 - 342 = 1458 arcsec
Apparent size grows at 0.43 arcsec/year
Therefore it will take 1458/0.43 = 3390.7 years give or take a few weeks.
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Originally posted by AThousandYoungThank you for the compliment, but I am not really a genius. 🙄
Maybe the star is in front. Ever thought of THAT, GENIUS?!?!?!??!
ðŸ˜
The moon is about 384 000 kilometres from earth. The nearest star, our sun, is about 150 000 000 kilometres from us. If any star would lie in front of the moon we would be burnt to ashes in a microsecond.
Oh, you made a joke? See? I'm not a genius after all! 😉
Originally posted by FabianFnasBut you said your IQ was 190...
Thank you for the compliment, but I am not really a genius. 🙄
The moon is about 384 000 kilometres from earth. The nearest star, our sun, is about 150 000 000 kilometres from us. If any star would lie in front of the moon we would be burnt to ashes in a microsecond.
Oh, you made a joke? See? I'm not a genius after all! 😉
Originally posted by sonhouseI've never told you to do anything!
But you said your IQ was 190...
Originally posted by FabianFnas
Never said this?
You must mistake me for another...
Originally posted by PBE6
Don't tell me what to do ðŸ˜
Interesting...
PBE6 and sonhouse must be the same person...?
I don't get it?
Originally posted by Marsanhaha. nobody responds to either of the answers we gave.....classic.
Perhaps i am mistaken but this is one of those "looks hard but actually quite easy" problems.
60 arcsec = 1 arc min
We want long axis of apparent size of nebula to span 1800 arcsec, it currently spans 5.7*60 = 342 arcsec
Therefore apparent size of nebula needs to grow 1800 - 342 = 1458 arcsec
Apparent size grows at 0.43 arcsec/year
Therefore it will take 1458/0.43 = 3390.7 years give or take a few weeks.