This is a pretty interesting article! I have some questions, though:

1. What properties of space facilitate quantum experiments more than terrestrial environments? Reduced gravity? Vacuums?

2. How does the satellite create pairs of entangled photons? I missed the memo that we could control entanglement...

3. When two photons are entangled, what kinds of properties about them are useful to observe/control, that give us information about or control of the twin? All I can think of are positional properties like position, speed, acceleration, etc...