Exhibit 16.3
May 5, 2022
U.S. Securities and Exchange Commission
Office of the Chief Accountant
100 F Street, NE
Washington, DC 20549
Re: Astra Space, Inc.
File No. 333-257930
Dear Sir or Madam:
We have read the statements made by Astra Space, Inc. pursuant to Item 304(a)(1) included under the section titled “Changes in Independent Registered Public Accounting Firm” as part of the Post-Effective Amendment No. 1 to the Registration Statement on Form S-1 dated May 5, 2022. We agree with the statements concerning our Firm contained therein.
Very truly yours,
/s/ GRANT THORNTON LLP
