At 12:42 Beijing time on March 19, SpaceX launched a new batch of 53 StarLinks (Group 4-12) at SLC-40, Kajiao Space Force Base.
The booster in this mission is the B1051-12, which has been launched 11 times before, landing on the unmanned ship "Please read the manual", which is also spaceX's first 12-hand rocket. About 63 minutes later, the 53 Starlink satellites were successfully deployed.
A good reference, as of March 19, 2022, the number of Satellite Launches and the use of the Falcon 9 stage rocket, a total of 44 times, 2574 satellites.
Image source: Rykllan
Interestingly, SpaceX has been using more than second-hand rockets for its own Starlink satellite network.
As an aside, if you like Rykllan's work, you can support him in the link on the right https://www.patreon.com/posts/63990081
Design and build safe, reliable and perishable satellites
Credit：SpaceX
As the satellite's altitude continues to decrease, it encounters an increasing atmospheric density. Initially, these atmospheric molecules will hit the satellite, but as the density of the air increases, a high-pressure shock wave will form in front of the satellite. As the satellite slows down further and descends into the atmosphere, its orbital energy will be transferred to the air, heating the air molecules into plasma. The hot plasma sheath envelops the satellite, causing its temperature to rise sharply. Starlink satellites are designed to die when they re-enter Earth's atmosphere, meaning they pose no threat to people or property on the ground. Extinction design requires an investment in significant engineering resources, and this often requires increased cost and even quality of SpaceX satellites, such as SpaceX's decision to use aluminum instead of composite outer-wrapped pressure vessels as fuel tanks for propulsion systems. SpaceX has used this method to safely de-orbit more than 200 satellites. By building reliable, fragmented satellites, planning active de-orbit procedures, and designing for full demiseability, SpaceX ensures itself to maintain the sustainability and safety of its space.