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        <EndYearBalanceAmt>2350</EndYearBalanceAmt>
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      <CYMinus1YrEndwmtFundGrp>
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        <OtherExpendituresAmt>2</OtherExpendituresAmt>
        <EndYearBalanceAmt>2350</EndYearBalanceAmt>
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        <EndYearBalanceAmt>52350</EndYearBalanceAmt>
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      <PrmnntEndowmentBalanceEOYPct>1.00000</PrmnntEndowmentBalanceEOYPct>
      <EndowmentsHeldUnrelatedOrgInd>0</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>0</EndowmentsHeldRelatedOrgInd>
      <LeaseholdImprovementsGrp>
        <OtherCostOrOtherBasisAmt>1132066</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>67441</DepreciationAmt>
        <BookValueAmt>1064625</BookValueAmt>
      </LeaseholdImprovementsGrp>
      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>476211</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>245589</DepreciationAmt>
        <BookValueAmt>230622</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>1295247</TotalBookValueLandBuildingsAmt>
      <OtherSecuritiesGrp>
        <Desc>CERTIFICATES OF DEPOSITS</Desc>
        <BookValueAmt>586284</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
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      <OtherSecuritiesGrp>
        <Desc>MUTUAL FUND</Desc>
        <BookValueAmt>39612</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
      </OtherSecuritiesGrp>
      <TotalBookValueSecuritiesAmt>625896</TotalBookValueSecuritiesAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>LIABILITY TO BENEFICIARIES UNDER SPLIT INTEREST AGREEMENTS</Desc>
        <Amt>11960</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>DEFERRED RENT</Desc>
        <Amt>132426</Amt>
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      <TotalLiabilityAmt>144386</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>3788852</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>2405</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>2405</RevenueNotReportedAmt>
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      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>3786447</TotalRevenuePerForm990Amt>
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      <ExpensesSubtotalAmt>5624490</ExpensesSubtotalAmt>
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      <TotalExpensesPerForm990Amt>5624490</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ACCOUNTING STANDARD ON ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES PROVIDES GUIDANCE ON HOW UNCERTAIN TAX POSITIONS SHOULD BE RECOGNIZED, MEASURED, PRESENTED AND DISCLOSED IN THE FINANCIAL STATEMENTS. EXAMPLES OF TAX POSITIONS INCLUDE THE TAX-EXEMPT STATUS OF THE SOCIETY AND VARIOUS POSITIONS RELATED TO THE POTENTIAL SOURCES OF UNRELATED BUSINESS TAXABLE INCOME (UBIT). THE SOCIETY BELIEVES THAT IT HAS NO UNCERTAIN TAX POSITIONS THAT IMPACT ITS FINANCIAL STATEMENTS.</ExplanationTxt>
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        <EmployeeCnt>0</EmployeeCnt>
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      <AccountActivitiesOutsideUSGrp>
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        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>VOLUNTEER PROGRAM SUPPORT</TypeOfActivitiesConductedTxt>
        <RegionTotalExpendituresAmt>61599</RegionTotalExpendituresAmt>
      </AccountActivitiesOutsideUSGrp>
      <AccountActivitiesOutsideUSGrp>
        <RegionTxt>NORTH AMERICA</RegionTxt>
        <OfficesCnt>0</OfficesCnt>
        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>MEMBERSHIP FEES</TypeOfActivitiesConductedTxt>
        <RegionTotalExpendituresAmt>6843</RegionTotalExpendituresAmt>
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      <SubtotalOfficesCnt>0</SubtotalOfficesCnt>
      <SubtotalEmployeesCnt>0</SubtotalEmployeesCnt>
      <ContinutationTotalOfficeCnt>0</ContinutationTotalOfficeCnt>
      <ContinutationTotalEmployeeCnt>0</ContinutationTotalEmployeeCnt>
      <TotalOfficeCnt>0</TotalOfficeCnt>
      <TotalEmployeeCnt>0</TotalEmployeeCnt>
      <SubtotalSpentAmt>182184</SubtotalSpentAmt>
      <ContinuationSpentAmt>0</ContinuationSpentAmt>
      <TotalSpentAmt>182184</TotalSpentAmt>
      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>EUROPE</RegionTxt>
        <PurposeOfGrantTxt>TPS LASER BEES</PurposeOfGrantTxt>
        <CashGrantAmt>13230</CashGrantAmt>
      </GrantsToOrgOutsideUSGrp>
      <TotalOtherOrgCnt>1</TotalOtherOrgCnt>
      <ForeignIndividualsGrantsGrp>
        <TypeOfAssistanceTxt>NEO RESEARCH</TypeOfAssistanceTxt>
        <RegionTxt>SOUTH AMERICA</RegionTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>2400</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
      </ForeignIndividualsGrantsGrp>
      <ForeignIndividualsGrantsGrp>
        <TypeOfAssistanceTxt>PUBLIC OUTREACH SUPPORT</TypeOfAssistanceTxt>
        <RegionTxt>SOUTH AMERICA</RegionTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>400</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
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      <TransferToForeignCorpInd>0</TransferToForeignCorpInd>
      <InterestInForeignTrustInd>0</InterestInForeignTrustInd>
      <ForeignCorpOwnershipInd>0</ForeignCorpOwnershipInd>
      <PassiveForeignInvestmestCoInd>0</PassiveForeignInvestmestCoInd>
      <ForeignPartnershipInd>0</ForeignPartnershipInd>
      <BoycottCountriesInd>0</BoycottCountriesInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PLANETARY SOCIETY HAS ABOUT 6,000 NON US MEMBERS IN ABOUT 100 COUNTRIES. HOWEVER THE EXPENSES ASSOCIATED WITH THESE MEMBERS IS GENERATED IN THE US. THE ORGANIZATION USES THE ACCURAL METHOD OF ACCOUNTING.</ExplanationTxt>
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        <FoodAndBeverageEvent1Amt>44697</FoodAndBeverageEvent1Amt>
        <EntertainmentEvent1Amt>3548</EntertainmentEvent1Amt>
        <OtherDirectExpensesEvent1Amt>175273</OtherDirectExpensesEvent1Amt>
        <GrossReceiptsTotalAmt>213288</GrossReceiptsTotalAmt>
        <GrossRevenueTotalEventsAmt>213288</GrossRevenueTotalEventsAmt>
        <RentFcltyCostsTotalEventsAmt>54430</RentFcltyCostsTotalEventsAmt>
        <FoodAndBeverageTotalEventsAmt>44697</FoodAndBeverageTotalEventsAmt>
        <EntertainmentTotalEventsAmt>3548</EntertainmentTotalEventsAmt>
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    <IRS990ScheduleI documentId="RetDoc1041900001">
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>HARVARD UNIVERSITY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>17 OXFORD STREET</AddressLine1Txt>
          <CityNm>CAMBRIDGE</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
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        <ValuationMethodUsedDesc>CASH</ValuationMethodUsedDesc>
        <PurposeOfGrantTxt>SETI TELESCOPE</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>HUNTINGTON LIBRARY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
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          <CityNm>SAN MARINO</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>91108</ZIPCd>
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        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
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        <ValuationMethodUsedDesc>CASH</ValuationMethodUsedDesc>
        <PurposeOfGrantTxt>ARCHIVES</PurposeOfGrantTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THOSE WHO RECEIVE GRANTS FROM THE PLANETARY SOCIETY TYPICALLY PROVIDE INFORMAL UPDATES TO THE SOCIETY'S DIRECTOR OF SCIENCE AND TECHNOLOGY APPROXIMATELY EVERY 6 MONTHS. IN ADDITION, PROGRESS IS ASSESSED BY THE DIRECTOR OF SCIENCE AND TECHNOLOGY VIA PERIODIC PHONE CALLS, VISITS AND EMAILS WITH GRANTEES.</ExplanationTxt>
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    </IRS990ScheduleI>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <CompensationCommitteeInd>X</CompensationCommitteeInd>
      <Form990OfOtherOrganizationsInd>X</Form990OfOtherOrganizationsInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
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      <InitialContractExceptionInd>0</InitialContractExceptionInd>
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        <PersonNm>WILLIAM NYE</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>JENNIFER VAUGHN</PersonNm>
        <TitleTxt>COO</TitleTxt>
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        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>8621</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>156714</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S OFFICERS REVIEW COMPETITIVE SALARY DATA. EACH EMPLOYEE UNDERGOES AN ANNUAL PERFORMANCE REVIEW LED BY THE ORGANIZATION'S OFFICERS AND DIRECTORS. THESE OFFICERS AND DIRECTORS MEET TO DISCUSS COMPENSATION FOR ALL NON-OFFICER EMPLOYEES BASED ON JOB DUTIES, PERFORMANCE, COMPETITIVE SALARY DATA, AND COST OF LIVING ADJUSTMENTS. THE CEO SETS THE SALARY FOR THE COO AND CFO. THE BOARD OF DIRECTORS (EXCLUDING THE CEO) DETERMINES THE SALARY OF THE CEO.</ExplanationTxt>
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    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FULL BOARD OF DIRECTORS RECEIVES THE 990 ONE WEEK PRIOR TO FILING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>EACH YEAR AT THE FALL BOARD MEETING, EACH BOARD MEMBER REVIEWS THE CONFLICT OF INTEREST POLICY AND SIGNS A CONFLICT OF INTEREST STATEMENT. BOARD MEMBERS HAVE ACCESS TO THE POLICY THROUGHOUT THE YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S OFFICERS REVIEW COMPETITIVE SALARY DATA. EACH EMPLOYEE UNDERGOES AN ANNUAL REVIEW LED BY THE ORGANIZATION'S OFFICERS AND DIRECTORS. THESE OFFICERS AND DIRECTORS MEET TO DISCUSS COMPENSATION FOR ALL NON-OFFICER EMPLOYEES BASED ON THEIR JOB DUTIES, PERFORMANCE, COMPETITIVE SALARY DATA, AND COST OF LIVING ADJUSTMENTS. THE CEO SETS THE SALARY FOR THE OTHER OFFICERS. THE BOARD OF DIRECTORS (EXCLUDING THE CEO) DETERMINES THE SALARY OF THE CEO.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AUIDTED FINANCIAL STATEMENTS AND IRS FORM 990 ARE AVAILABLE UPON REQUEST. DOCUMENTS CAN BE VIEWED AT OUR OFFICE, MAILED, OR E-MAILED TO THE REQUESTING PARTY. AUDITED FINANCIAL STATEMENTS AND IRS FORM 990 ARE ALSO PUBLISHED ON THE SOCIETY'S WEBSITE.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>