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I

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sometimes an astronomy it's not what you

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see but what you don't see that says the

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most that may be the case with 47 to

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Canaan a densely packed star cluster in

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the southern hemisphere astronomer Ron

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gilliland surveyed 47 tuck looking for a

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certain class of planets so-called hot

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Jupiters because they're roughly the

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same size as Jupiter but live in very

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tight orbits around their stars and are

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common in our part of the galaxy the

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eight-day Hubble survey turned up a

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surprise and 35,000 star surveyed no

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planets none Gilliland's team fine-tuned

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Hubble so that it could see the slide

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dimming of stars that happens when a

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jupiter-sized planet passes between them

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and the earth in fact the search

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technique was so sensitive that Hubble

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did pick up the variations in several

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binary star pairs but still no planets

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47 Chuck is very different from our

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local neighborhood stars are much closer

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together and they lack the heavy metals

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common in our area this result doesn't

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rule out the presence of other planets

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but the zero score may have a lot to say

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about some of astronomy's biggest

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questions I think that's telling us that

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it's probably the case that stars born

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into this environment very crowded low

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metallicity are not likely not as likely

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to have planets as those in the local

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environment astronomers need more data

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from 47 to County to determine whether

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the clusters lack of metals or its tidal

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forces or some other unknown force keeps

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I think that's telling us that it's

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probably the case that stars born into

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this environment very crowded low

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metallicity are not likely not as likely