The distance from the Sun to the Earth is 93,000,000 miles. When discussing distances within the solar system, it is often convenient to use this distance as a comparison. So astronomers use the...
"32 years" is a period of time, not a distance. When astronomers get together and talk about the period of time that we call '32years', they refer to it among themselves as "thirty-two...
Phobos is one of the moons of Mars. Mars averages 1.52 AU from the Sun, while the Earth averages 1 AU from the Sun. So at conjunction (when Mars is closest to Earth), Mars is about .5 AU away, and at...