What goes up, has to eventually come down….mostly!
•Re-entry is perhaps the most dangerous portion of spaceflight. You re-enter the atmosphere at close to 17,000 mph and travel through super-heated charged plasma as your craft creates friction with atmospheric gases that easily exceed 1200 degrees Fahrenheit. •In a planned re-entry, a craft will perform a retrograde burn in the opposite direction of its momentum until its periapsis is low enough to re-enter the Earth’s atmosphere where friction will continue to slow the craft.
Crowd Questions:
Most re-entries are planned but give me an example of an unplanned or uncontrolled re-entry?

Example: Others can occur when a broken satellite eventually gets to a lower and lower orbit by a mix tidal forces and charged solar wind creating a retrograde pressure over time on the solar panels.