Is it true that if your in space you can see 18 sunsets?

Answer 1

That would depend on the altitude of your spacecraft. For spacecraft like the Space Shuttle in low Earth orbit (LEO), the orbital period is about 90 minutes, so you would see 18 sunrises and 18 sunsets in each 24-hour day.

At higher or different orbits, the number would be variable. In geosynchronous orbit, you would see one per day, but only around the Equinoxes; the remainder of the year, you would see none, because the satellite would not go into the Earth's shadow.