NotSure wrote:It is apparently sensitive enough to detect a candle on one of Jupiter's moons!
https://www.ralspace.stfc.ac.uk/Pages/First-instrument-for-the-JWST-is-completed-and-handed-over-to-NASA.aspx
Which moon is it on?
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NotSure wrote:It is apparently sensitive enough to detect a candle on one of Jupiter's moons!
https://www.ralspace.stfc.ac.uk/Pages/First-instrument-for-the-JWST-is-completed-and-handed-over-to-NASA.aspx
MrFoolish wrote:NotSure wrote:It is apparently sensitive enough to detect a candle on one of Jupiter's moons!
https://www.ralspace.stfc.ac.uk/Pages/First-instrument-for-the-JWST-is-completed-and-handed-over-to-NASA.aspx
Which moon is it on?
Mike4 wrote:MrFoolish wrote:NotSure wrote:It is apparently sensitive enough to detect a candle on one of Jupiter's moons!
https://www.ralspace.stfc.ac.uk/Pages/First-instrument-for-the-JWST-is-completed-and-handed-over-to-NASA.aspx
Which moon is it on?
I'm more concerned about who put it there!
MrFoolish wrote:NotSure wrote:It is apparently sensitive enough to detect a candle on one of Jupiter's moons!
https://www.ralspace.stfc.ac.uk/Pages/First-instrument-for-the-JWST-is-completed-and-handed-over-to-NASA.aspx
Which moon is it on?
scrumpyjack wrote:Is it alight?
NotSure wrote:Using round numbers throughout for an 'order or magnitude' estimate, a candle outputs around 100 W.
GrahamPlatt wrote:NotSure wrote:Using round numbers throughout for an 'order or magnitude' estimate, a candle outputs around 100 W.
Where do you buy your candles?
GrahamPlatt wrote:NotSure wrote:Using round numbers throughout for an 'order or magnitude' estimate, a candle outputs around 100 W.
Where do you buy your candles?
GrahamPlatt wrote:NotSure wrote:Using round numbers throughout for an 'order or magnitude' estimate, a candle outputs around 100 W.
Where do you buy your candles?
jfgw wrote:GrahamPlatt wrote:NotSure wrote:Using round numbers throughout for an 'order or magnitude' estimate, a candle outputs around 100 W.
Where do you buy your candles?
A standard British candle was made from spermaceti from sperm whales and emitted about 80W. The French were ahead of the game with a vegan alternative.
I didn't realise that Jupiter had so many moons — 79 discovered as of this 2018 article, https://carnegiescience.edu/news/dozen-new-moons-jupiter-discovered-including-one-%E2%80%9Coddball%E2%80%9D. Io has an atmosphere of, mostly, sulphur dioxide. I don't know about the other moons. It may be possible to formulate a candle that will burn in such an atmosphere (I am not a chemist). Combustion can occur without oxygen, for example, lithium will burn in nitrogen.
I am opening a book as to which the telescope will find first:
4/5 the candle;
1/1 the teapot.
Julian F. G. W.
jfgw wrote:I am opening a book as to which the telescope will find first:
4/5 the candle;
1/1 the teapot
MrFoolish wrote:jfgw wrote:I am opening a book as to which the telescope will find first:
4/5 the candle;
1/1 the teapot
More likely a McDonalds drink cup, on the basis they turn up in litter everywhere.
jfgw wrote:MrFoolish wrote:jfgw wrote:I am opening a book as to which the telescope will find first:
4/5 the candle;
1/1 the teapot
More likely a McDonalds drink cup, on the basis they turn up in litter everywhere.
It wouldn't surprise be if they had a branch on one of Jupiter's moons.
Julian F. G. W.
NotSure wrote:MrFoolish wrote:NotSure wrote:It is apparently sensitive enough to detect a candle on one of Jupiter's moons!
https://www.ralspace.stfc.ac.uk/Pages/First-instrument-for-the-JWST-is-completed-and-handed-over-to-NASA.aspx
Which moon is it on?
I've no idea (and I suspect your question is rhetorical anyway), but, I ran some quick numbers to see if this claim was even remotely plausible (E&OE).
Using round numbers throughout for an 'order or magnitude' estimate, a candle outputs around 100 W. If we assume (for simplicity) that all the power is concentrated the middle of the JW IR band, i.e. at 10 microns, that is around 1e22 photons/s.
Applying the inverse square law, with Jupiter around 600 million km away, and the JW dish of diameter 6.5 m, I make it that 2 or 3 photons/minute could be captured by the JW. So just about plausible with a long exposure and an extremely high SNR?
9873210 wrote:The original quote is an overstatement. Webb might detect a candle against a dark background at the distance of Jupiter. It could not resolve a candle on a sunlit Jovian moon......
NotSure wrote:9873210 wrote:The original quote is an overstatement. Webb might detect a candle against a dark background at the distance of Jupiter. It could not resolve a candle on a sunlit Jovian moon......
Party pooper Of couse you'd only try at night!
Next you'll be pointing out that the candle would be cold anyway as there's no oxygen on Europa (at least not in gaseous form).....
NotSure wrote:9873210 wrote:The original quote is an overstatement. Webb might detect a candle against a dark background at the distance of Jupiter. It could not resolve a candle on a sunlit Jovian moon......
Party pooper Of couse you'd only try at night!
Next you'll be pointing out that the candle would be cold anyway as there's no oxygen on Europa (at least not in gaseous form).....
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