Watching Salsa’s reentry live from the sky

On 8 September 2024, the first of four Cluster satellites will return home and burn up in Earth’s atmosphere in an uncontrolled ‘targeted reentry’ over a remote area of the South Pacific Ocean. 

In the nearly 70 years of spaceflight about 10 000 intact satellites and rocket bodies have reentered the atmosphere. Yet we still lack a clear view on what actually happens during a reentry. 

An airborne observation experiment will now attempt to witness the ‘Salsa’ (Cluster 2) reentry. Scientists on board a small plane will try to collect rare data on how and when a satellite breaks up, which can be used to make satellite reentries safer and more sustainable in the future.