euesa1-1, Exercise 3: Test a fact

This exercise has no fixed answer. A good answer has three parts:

1. The fact as you first wrote it down, before checking.
2. A source for it (ESA's own site, a national agency or a reliable reference work).
3. A note on whether the source agreed or corrected you, and what kind of mistake it was (a date, a name, European versus American).

Memory usually gets the broad story right and the details wrong, which is the pattern described in this chapter.