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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
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        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <TotalReportableCompFromOrgAmt>160364</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
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      <IndivRcvdGreaterThan100KCnt>1</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>1</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <CntrctRcvdGreaterThan100KCnt>0</CntrctRcvdGreaterThan100KCnt>
      <InfoInScheduleOPartVIIIInd>X</InfoInScheduleOPartVIIIInd>
      <FederatedCampaignsAmt>1602</FederatedCampaignsAmt>
      <AllOtherContributionsAmt>1822574</AllOtherContributionsAmt>
      <NoncashContributionsAmt>255370</NoncashContributionsAmt>
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        <BusinessCd>900099</BusinessCd>
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        <BusinessCd>900099</BusinessCd>
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      <ProgramServiceRevenueGrp>
        <Desc>PROGRAM FEES</Desc>
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      <ProgramServiceRevenueGrp>
        <Desc>MEMBERSHIP FEES</Desc>
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        <RelatedOrExemptFuncIncomeAmt>50476</RelatedOrExemptFuncIncomeAmt>
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      <OtherRevenueMiscGrp>
        <Desc>MISCELLANEOUS REVENUE</Desc>
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      <TotalRevenueGrp>
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      <InformationTechnologyGrp>
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        <ProgramServicesAmt>41395</ProgramServicesAmt>
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      <OtherExpensesGrp>
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      <OtherExpensesGrp>
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      <TotalFunctionalExpensesGrp>
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      <LandBldgEquipBasisNetGrp>
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      <TotalAssetsGrp>
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      <AccountsPayableAccrExpnssGrp>
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      <TotalLiabilitiesGrp>
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        <EOYAmt>16106031</EOYAmt>
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      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
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      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>15728601</BOYAmt>
        <EOYAmt>30980864</EOYAmt>
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      <ReconcilationRevenueExpnssAmt>-146649</ReconcilationRevenueExpnssAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
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        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
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      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
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    <IRS990ScheduleA documentId="RetDoc1039100001">
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      <GiftsGrantsContriRcvd170Grp>
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        <CurrentTaxYearMinus3YearsAmt>3985602</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>3924478</CurrentTaxYearMinus2YearsAmt>
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        <CurrentTaxYearAmt>1824176</CurrentTaxYearAmt>
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        <TotalAmt>13754965</TotalAmt>
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      <GrossInvestmentIncome170Grp>
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        <CurrentTaxYearMinus3YearsAmt>6006</CurrentTaxYearMinus3YearsAmt>
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        <CurrentTaxYearAmt>827610</CurrentTaxYearAmt>
        <TotalAmt>1274486</TotalAmt>
      </GrossInvestmentIncome170Grp>
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        <CurrentTaxYearAmt>35850</CurrentTaxYearAmt>
        <TotalAmt>153964</TotalAmt>
      </OtherIncome170Grp>
      <TotalSupportAmt>15183415</TotalSupportAmt>
      <GrossReceiptsRltdActivitiesAmt>3157414</GrossReceiptsRltdActivitiesAmt>
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      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
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        <ContributorBusinessName>
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        </ContributorBusinessName>
        <ContributorUSAddress>
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          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
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    </IRS990ScheduleB>
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      <PaidStaffOrManagementInd>1</PaidStaffOrManagementInd>
      <DirectContactLegislatorsInd>1</DirectContactLegislatorsInd>
      <NotDescribedSection501c3Ind>0</NotDescribedSection501c3Ind>
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        <BookValueAmt>226600</BookValueAmt>
      </LandGrp>
      <LeaseholdImprovementsGrp>
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      </LeaseholdImprovementsGrp>
      <EquipmentGrp>
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      </EquipmentGrp>
      <OtherLandBuildingsGrp>
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      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>300149</TotalBookValueLandBuildingsAmt>
      <OtherLiabilitiesOrgGrp>
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        <Amt>337063</Amt>
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      <TotalLiabilityAmt>337063</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
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      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>3453588</TotalRevenuePerForm990Amt>
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      <TotalExpensesPerForm990Amt>3600237</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>MANAGEMENT HAS EVALUATED THE EFFECT OF GUIDANCE SURROUNDING UNCERTAIN INCOME TAX POSITIONS AND CONCLUDED THAT THE FOUNDATION HAS NO SIGNIFICANT FINANCIAL STATEMENT EXPOSURE TO UNCERTAIN INCOME TAX POSITIONS AT JUNE 30, 2025 AND 2024. THE FOUNDATION IS NOT CURRENTLY UNDER AUDIT BY ANY TAX JURISDICTION.</ExplanationTxt>
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        <TitleTxt>PRESIDENT AND CEO</TitleTxt>
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        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
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        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
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        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>22479</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>187978</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
    </IRS990ScheduleJ>
    <IRS990ScheduleM documentId="RetDoc1042900001">
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>7</ContributionCnt>
        <NoncashContributionsRptF990Amt>253094</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>NYSE</MethodOfDeterminingRevenuesTxt>
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      <ReviewProcessUnusualNCGiftsInd>0</ReviewProcessUnusualNCGiftsInd>
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    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990 IS PREPARED BY A CERTIFIED PUBLIC ACCOUNTANT. THE EXECUTIVE DIRECTOR, TREASURER, AND ACCOUNTING MANAGER REVIEW FORM 990. IT IS THEN FORWARDED TO THE INTERNAL AFFAIRS COMMITTEE AND BOARD OF DIRECTORS FOR FINAL REVIEW AND SUBSEQUENTLY FILED WITH THE IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD OF DIRECTORS MONITORS COMPLIANCE WITH THE CONFLICT OF INTEREST POLICY, WHICH REQUIRES BOARD MEMBERS AND MANAGEMENT TO FILE A DISCLOSURE STATEMENT AT LEAST ANNUALLY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD'S EXECUTIVE COMMITTEE EVALUATES THE COMPENSATION AND PERFORMANCE OF THE EXECUTIVE DIRECTOR. INDUSTRY REPORTS AND MARKET DATA ARE USED TO DETERMINE SALARY. OTHER OFFICERS ARE NOT COMPENSATED. THERE WERE NO KEY EMPLOYEES DURING FISCAL YEAR ENDING 6/30/25.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VIII, LINE 2A: PROGRAM SERVICE REVENUE</FormAndLineReferenceDesc>
        <ExplanationTxt>EXHIBIT SUPPORT FOR $1,072,423 - NORTHERN VIRGINIA SCIENCE CENTER FOUNDATION ("THE FOUNDATION") ENTERED INTO AN AGREEMENT ("3-PARTY AGREEMENT"), EFFECTIVE JANUARY 2, 2020, WITH THE SCIENCE MUSEUM OF VIRGINIA, A STATE AGENCY OF THE COMMONWEALTH OF VIRGINIA ("SMV"), AND THE LOUDOUN COUNTY BOARD OF SUPERVISORS, A POLITICAL SUBDIVISION OF THE COMMONWEALTH OF VIRGINIA ("LOUDOUN"), FOR THE DEVELOPMENT AND OPERATION OF THE NEW SCIENCE CENTER. THE CURRENT COST OF THE PROJECT IS PLANNED TO BE $119 MILLION, HOWEVER, THE TOTAL COST MAY CONTINUE TO VARY BASED ON ECONOMIC CIRCUMSTANCES. SMV WILL PAY FOR THE DESIGN AND CONSTRUCTION OF THE FACILITY AT AN ESTIMATED COST OF $73 MILLION. LOUDOUN COUNTY HAS PROVIDED $19 MILLION IN FUNDING TO SUPPORT DESIGNING AND FABRICATING THE EXHIBITS IN ADDITION TO PRIVATE FUNDS BEING RAISED FOR THIS PURPOSE. THE FOUNDATION IS ACCOUNTING FOR THE FUNDS IT RECEIVES FROM LOUDOUN AS AN EXCHANGE TRANSACTION AND RECOGNIZING AS PROGRAM SERVICES REVENUE IN EACH ACCOUNTING PERIOD TO THE EXTENT OF COSTS INCURRED FROM THE CONTRACTED EXHIBIT DESIGN-BUILD FIRM, ROTO.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>