BLUE ORIGIN ADDS A BE-7 THIRD STAGE TO NEW GLENN AND UNVEILS THE NORTHSTAR ENGINE

Summary from the TLDR Hardware newsletter

Northstar is a methalox booster engine that Blue Origin says cuts mass by 30% and parts count by 50% versus the BE-4 while raising thrust from 640,000 to 715,000 lbf, with assembly in under a day. No first-flight date is given, and New Glenn is still recovering from a pad explosion that happened in May.