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      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <AccountingFeesSchedule documentId="AccountingFeesSch">
      <AccountingFeesDetail>
        <CategoryTxt>ACCOUNTING FEES</CategoryTxt>
        <Amt>89742</Amt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>86194</DisbursementsCharitablePrpsAmt>
      </AccountingFeesDetail>
    </AccountingFeesSchedule>
    <CompensationExplanation documentId="CompensationExpl">
      <CompensationExplanationGrp>
        <PersonNm>SIMON PETER WORDEN</PersonNm>
        <ShortExplanationTxt>IN ACCORDANCE WITH AN AGENCY AGREEMENT, BREAKTHROUGH PRIZE FOUNDATION PAID AN ADDITIONAL $34,299 TO THE INDIVIDUAL ABOVE FOR SERVICES PROVIDED TO BREAKTHROUGH PRIZE IN LIFE SCIENCES FOUNDATION, A RELATED 501(C)(3) ORGANIZATION. BREAKTHROUGH PRIZE IN LIFE SCIENCES FOUNDATION REIMBURSES BREAKTHROUGH PRIZE FOUNDATION ON A PERIODIC BASIS IN ACCORDANCE WITH THE AGENCY AGREEMENT. THE INDIVIDUAL SERVES AS THE EXECUTIVE DIRECTOR OF THE LIFE IN THE UNIVERSE DIVISION OF BREAKTHROUGH PRIZE FOUNDATION.</ShortExplanationTxt>
      </CompensationExplanationGrp>
      <CompensationExplanationGrp>
        <PersonNm>KARL JOHANSSON</PersonNm>
        <ShortExplanationTxt>THE INDIVIDUAL IDENTIFIED ABOVE WAS NOT COMPENSATED FOR HIS ROLE AS A DIRECTOR. THE INVIDIUAL INCURRED AN AVERAGE OF 2 HOURS A WEEK OF CONSULTING SERVICES IN SUPPORT OF THE FOUNDATION'S EXEMPT PURPOSES, AND THOSE SERVICES WERE UNRELATED TO HIS ROLE AS A DIRECTOR.</ShortExplanationTxt>
      </CompensationExplanationGrp>
      <CompensationExplanationGrp>
        <PersonNm>MARGOT MCGINNESS</PersonNm>
        <ShortExplanationTxt>THE INDIVIDUAL IDENTIFIED ABOVE SERVES AS THE EXECUTIVE DIRECTOR OF THE LIFE SCIENCES, MATHEMATICS, PHYSICS, AND JUNIOR CHALLENGE DIVISIONS OF BREAKTHROUGH PRIZE FOUNDATION. THE INDIVIDUAL WAS NOT COMPENSATED FOR HER ROLE AS EXECUTIVE DIRECTOR. THE INDIVIDUAL INCURRED AN AVERAGE OF 10 HOURS A WEEK OF CONSULTING SERVICES IN SUPPORT OF THE FOUNDATION'S EXEMPT PURPOSES, AND THOSE SERVICES WERE UNRELATED TO HER ROLE AS EXECUTIVE DIRECTOR.</ShortExplanationTxt>
      </CompensationExplanationGrp>
    </CompensationExplanation>
    <DepreciationSchedule documentId="DepreciationSch" />
    <ExpenditureResponsibilityStmt documentId="ExpdturResponbltStmt">
      <ExpenditureResponsibilityGrp>
        <BusinessName>
          <BusinessNameLine1Txt>MILKY WAY RESEARCH FOUNDATION</BusinessNameLine1Txt>
        </BusinessName>
        <USAddress>
          <AddressLine1Txt>1900 N STREET NW</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20036</ZIPCd>
        </USAddress>
        <GrantAmt>1670000</GrantAmt>
        <PurposeOfGrantTxt>To support the furtherance of medical research</PurposeOfGrantTxt>
        <ExpendedByGranteeAmt>1531342</ExpendedByGranteeAmt>
        <AnyDiversionByGranteeTxt>NO</AnyDiversionByGranteeTxt>
        <DatesOfReportsByGranteeTxt>12/29/2021</DatesOfReportsByGranteeTxt>
        <VerificationDt>2021-12-29</VerificationDt>
        <ResultsOfVerificationTxt>TO THE KNOWLEDGE OF THE FOUNDATION, AND BASED UPON THE REPORTS FURNISHED BY THE GRANT RECIPIENT, NO PART HAS BEEN USED FOR OTHER THAN ITS INTENDED PURPOSE.</ResultsOfVerificationTxt>
      </ExpenditureResponsibilityGrp>
    </ExpenditureResponsibilityStmt>
    <GeneralExplanationAttachment documentId="GeneralExplAttach">
      <GeneralExplanationGrp>
        <IdentifierTxt>Amended return statement</IdentifierTxt>
        <FormAndLineReferenceDesc>Amended return statement</FormAndLineReferenceDesc>
        <MediumExplanationTxt>Part VII-B, Line 5b Part VII-B, Line 5b has been updated to "No". This question was inadvertently answered "yes" on the originally filed return. No transactions failed to qualify under the exceptions described in Regulations section 53.4945.</MediumExplanationTxt>
      </GeneralExplanationGrp>
      <GeneralExplanationGrp>
        <IdentifierTxt>Part IX-A, Line 1</IdentifierTxt>
        <FormAndLineReferenceDesc>Part IX-A, Line 1</FormAndLineReferenceDesc>
        <MediumExplanationTxt>EXPENSES: $10,208,416 THE BREAKTHROUGH PRIZE FOUNDATION CONTINUED ITS INITIATIVE TO STUDY LIFE IN THE UNIVERSE. THE INITIATIVE CONSISTS OF A SCIENTIFIC SEARCH FOR SIGNS OF LIFE BEYOND EARTH. EXPENSES INCURRED AS PART OF THIS INITIATIVE DURING THE YEAR ENDED MAY 31, 2021 RELATED TO RESEARCH PROGRAMS AND THE ORGANIZATION OF CONFERENCES TO PROMOTE THE INITIATIVE. ACTIVE RESEARCH PROJECTS INCLUDE AN ASTRONOMICAL SURVEY OF THE MILLION CLOSEST STARS WITH THE WORLD'S MOST POWERFUL RADIO AND LASER TELESCOPES AND RESEARCH TO DEMONSTRATE PROOF OF CONCEPT FOR ULTRA-FAST LIGHT-DRIVEN "NANOCRAFTS" TO BE LAUNCHED TO ALPHA CENTAURI. THE INITIATIVES MAY FUND AN INTERNATIONAL COMPETITION TO GENERATE MESSAGES REPRESENTING HUMANITY AND PLANET EARTH, WHICH ONE DAY MIGHT BE SENT TO CIVILIZATIONS BEYOND EARTH. THE INITIATIVE IS INTENDED TO SPAN 10 YEARS AND EXPENSES ARE PLANNED TO TOTAL APPROXIMATELY $100,000,000. PART IX-A, LINE 2 EXPENSES: $10,051,950 THE FOUNDATION AWARDED PRIZES TO SCIENTISTS AND RESEARCHERS WHO DEMONSTRATED EXCELLENCE IN RESEARCH AIMED AT FUNDAMENTAL PHYSICS AND MATHEMATICS. A SPECIAL BREAKTHROUGH PRIZE IN FUNDAMENTAL PHYSICS WAS AWARDED TO ONE INDIVIDUAL WHO MADE ADVANCES IN THE PHYSICS FIELD. THE BREAKTHROUGH PRIZE IN MATHEMATICS WAS AWARDED TO ONE INDIVIDUAL WHO MADE SIGNIFICANT ACCOMPLISHMENTS IN MATHEMATICS. THE BREAKTHROUGH PRIZES IN FUNDAMENTAL PHYSICS WERE AWARED TO THREE INDIVIDUALS WHO MADE ADVANCES IN FIELDS WITH DEEP CONNECTIONS TO PHYSICS. THE NEW HORIZONS IN PHYSICS PRIZES WERE AWARDED TO NINE YOUNG RESEARCHERS WHO PRODUCED SIGNIFICANT WORK IN FIELDS WITH CONNECTIONS TO PHYSICS. THE NEW HORIZONS IN MATHEMATICS PRIZES WERE AWARDED TO THREE YOUNG RESEARCHERS WHO PRODUCED SIGNIFICANT WORK IN FIELDS WITH CONNECTIONS TO MATHEMATICS. THE MARYAM MIRZAKHANI NEW FRONTIERS PRIZE WAS AWARDED TO THREE OUTSTANDING WOMEN IN THE FIELD OF MATHEMATICS. TWO PRIZES WERE AWARDED FOR THE BREAKTHROUGH JUNIOR CHALLENGE, AN ANNUAL GLOBAL COMPETITION FOR STUDENTS TO INSPIRE CREATIVE THINKING ABOUT SCIENCE, INCLUDING ONE POST-SECONDARY SCHOLARSHIP AND ONE TEACHER PRIZE. PART IX-A, LINE 3 EXPENSES: $652,605 IN CONJUNCTION WITH THE BREAKTHROUGH PRIZE IN LIFE SCIENCES FOUNDATION, THE BREAKTHROUGH PRIZE FOUNDATION AWARDS PRIZES AT THE ANNUAL PRIZE CEREMONY. THE CEREMONY FEATURES CELEBRITY PRESENTATIONS, FILMS, COMEDY, AND LIVE MUSIC FROM MAJOR ARTISTS AND IS TELEVISED ON NATIONAL MEDIA OUTLETS. THE INTENT OF THE CEREMONY IS TO HELP CREATE AND STIMULATE INTEREST AND DISCOVERIES IN FUNDAMENTAL PHYSICS AND MATHEMATICS, AND TO CREATE PUBLIC AWARENESS AND A SENSE OF EXCITEMENT IN THOSE FIELDS. AS A RESULT OF THE COVID-19 PANDEMIC, THE CEREMONY WAS CANCELLED. THE FOUNDATION INCURRED EXPENSES DURING THE FISCAL YEAR ENDING MAY 31, 2021 IN PREPARATION OF THE CEREMONY PRIOR TO CANCELLATION. PART IX-A, LINE 4 EXPENSES: $281,354 THE FOUNDATION CONTINUED THE BREAKTHROUGH JUNIOR CHALLENGE PROGRAM (BJC), WHICH IS AN ANNUAL GLOBAL COMPETITION FOR SCIENCE AND MATH STUDENTS TO INSPIRE CREATIVE THINKING ABOUT FUNDAMENTAL CONCEPTS IN THE LIFE SCIENCES, PHYSICS OR MATHEMATICS. STUDENTS AGES 13 TO 18 ARE INVITED TO PARTICIPATE AND ARE ASKED TO CREATE AND SUBMIT VIDEOS THAT BRING TO LIFE A CONCEPT OR THEORY IN THE LIFE SCIENCES, PHYSICS, OR MATHEMATICS. STUDENTS CAN OPT TO FOCUS A VIDEO SPECIFICALLY ON SPACE EXPLORATION, PROVIDED THE PARTICULAR SUBJECT MATTER FITS WITHIN ONE OF THE ORIGINAL THREE CATEGORIES. AT THE CONCLUSION OF THE CONTEST, THE BJC WILL DECLARE ONE OVERALL CHALLENGE WINNER AND RECOGNIZE ONE SPACE EXPLORATION CHAMPION. THE WINNER OF THE BJC WILL BE AWARDED A $250,000 COLLEGE SCHOLARSHIP, $50,000 FOR THE SCIENCE TEACHER WHO INSPIRED THEM, AND A STATE-OF-THE-ART SCIENCE LAB FOR THEIR SCHOOL, VALUED AT $100,000. THE SPACE EXPLORATION CHAMPION WILL RECEIVE THE OPPORTUNITY TO ATTEND A ROCKET LAUNCH ON A DATE TO BE DETERMINED IN 2022. EXPENSES ASSOCIATED WITH THE ADMINISTERING OF THE CHALLENGE IN THE MAY 31, 2021 TAX YEAR TOTALED $281,354.</MediumExplanationTxt>
      </GeneralExplanationGrp>
    </GeneralExplanationAttachment>
    <LegalFeesSchedule documentId="LegalFeesSch">
      <LegalFeesGrp>
        <CategoryTxt>LEGAL FEES</CategoryTxt>
        <LegalFeesAmt>314182</LegalFeesAmt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>303009</DisbursementsCharitablePrpsAmt>
      </LegalFeesGrp>
    </LegalFeesSchedule>
    <OtherAssetsSchedule documentId="OtherAssetsSch">
      <OtherAssetsScheduleGrp>
        <Desc>DUE FROM RELATED PARTY</Desc>
        <BOYBookValueAmt>178097</BOYBookValueAmt>
        <EOYBookValueAmt>318450</EOYBookValueAmt>
        <EOYFMVAmt>318450</EOYFMVAmt>
      </OtherAssetsScheduleGrp>
      <OtherAssetsScheduleGrp>
        <Desc>SECURITY DEPOSIT</Desc>
        <BOYBookValueAmt>30888</BOYBookValueAmt>
        <EOYBookValueAmt>30888</EOYBookValueAmt>
        <EOYFMVAmt>30888</EOYFMVAmt>
      </OtherAssetsScheduleGrp>
    </OtherAssetsSchedule>
    <OtherExpensesSchedule documentId="OtherExpensesSch">
      <OtherExpensesScheduleGrp>
        <Desc>LIFE IN THE UNIVERSE</Desc>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>RESEARCH EXPENSE</Desc>
        <RevenueAndExpensesPerBooksAmt>4384102</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>4409592</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>BREAKTHROUGH PRIZE -</Desc>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>LEASING OF TELESCOPES</Desc>
        <RevenueAndExpensesPerBooksAmt>3194838</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>4775317</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>OFFICE EXPENSES</Desc>
        <RevenueAndExpensesPerBooksAmt>65726</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>64972</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>BREAKTHROUGH JUNIOR CHALLENGE-</Desc>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>PROGRAM EXPENSES</Desc>
        <RevenueAndExpensesPerBooksAmt>22123</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>21029</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>LIFE IN THE UNIVERSE-</Desc>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>PROGRAM EXPENSES</Desc>
        <RevenueAndExpensesPerBooksAmt>5611</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>5611</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>SCHOLARSHIP PROGRAM FEES</Desc>
        <RevenueAndExpensesPerBooksAmt>1950</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>1950</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>BANK FEES</Desc>
        <RevenueAndExpensesPerBooksAmt>468</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>468</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>0</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>CALIFORNIA FILING FEES</Desc>
        <RevenueAndExpensesPerBooksAmt>10</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>10</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
    </OtherExpensesSchedule>
    <OtherIncomeSchedule2 documentId="OtherIncomeSch2">
      <OtherIncomeDetail>
        <Desc>Miscellaneous INCOME</Desc>
        <RevenueAndExpensesPerBooksAmt>2</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>2</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
      </OtherIncomeDetail>
    </OtherIncomeSchedule2>
    <OtherLiabilitiesSchedule documentId="OtherLiabSch">
      <OtherLiabilitiesDetail>
        <Desc>DEFERRED RENT</Desc>
      </OtherLiabilitiesDetail>
    </OtherLiabilitiesSchedule>
    <OtherProfessionalFeesSchedule documentId="OthProfFeesSch">
      <OtherProfessionalFeesDetail>
        <CategoryTxt>CONSULTING FEES</CategoryTxt>
        <Amt>1871432</Amt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>1923530</DisbursementsCharitablePrpsAmt>
      </OtherProfessionalFeesDetail>
      <OtherProfessionalFeesDetail>
        <CategoryTxt>CEREMONY EXPENSE</CategoryTxt>
        <Amt>137965</Amt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>177048</DisbursementsCharitablePrpsAmt>
      </OtherProfessionalFeesDetail>
      <OtherProfessionalFeesDetail>
        <CategoryTxt>PUBLIC RELATIONS</CategoryTxt>
        <Amt>125000</Amt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>125000</DisbursementsCharitablePrpsAmt>
      </OtherProfessionalFeesDetail>
      <OtherProfessionalFeesDetail>
        <CategoryTxt>FILM PRODUCTION FEES</CategoryTxt>
        <Amt>56414</Amt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>82247</DisbursementsCharitablePrpsAmt>
      </OtherProfessionalFeesDetail>
    </OtherProfessionalFeesSchedule>
    <TaxesSchedule documentId="TaxesSchedule">
      <TaxesDetail>
        <CategoryTxt>FEDERAL EXCISE TAX</CategoryTxt>
        <Amt>201</Amt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>0</DisbursementsCharitablePrpsAmt>
      </TaxesDetail>
    </TaxesSchedule>
    <TransfersToControlledEntities documentId="TransToControlledEnt">
      <TransfersToControlledEntGrp>
        <BusinessName>
          <BusinessNameLine1Txt>BREAKTHROUGH STARSHOT FOUNDATION LLC</BusinessNameLine1Txt>
        </BusinessName>
        <USAddress>
          <AddressLine1Txt>C/O JAMES A HUTCHINSON ESQ</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20036</ZIPCd>
        </USAddress>
        <EIN>844020845</EIN>
        <Desc>N/A</Desc>
        <Amt>0</Amt>
      </TransfersToControlledEntGrp>
      <TransfersToControlledEntGrp>
        <BusinessName>
          <BusinessNameLine1Txt>BREAKTHROUGH WATCH FOUNDATION LLC</BusinessNameLine1Txt>
        </BusinessName>
        <USAddress>
          <AddressLine1Txt>C/O JAMES A HUTCHINSON ESQ</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20036</ZIPCd>
        </USAddress>
        <EIN>460677985</EIN>
        <Desc>N/A</Desc>
        <Amt>0</Amt>
      </TransfersToControlledEntGrp>
    </TransfersToControlledEntities>
  </ReturnData>
</Return>
