The name for a partner who is involved in a queerplatonic relationship, as in he's my zucchini.
Curiosity, a rover that's exploring Mars as of 2014, has a top ground speed of 1.5 inches per second, or about 0.1 mph. Curiosity landed on Mars on Aug. 5, 2012.
It could take as long as 120 days. Most space probes do not accelerate constantly, but use planetary gravity effects to speed up or slow down, which involves long, complex orbits taking a year or more. In this case, a spacecraft actually has to decelerate from the Earth's orbital speed (about 107,000 km/hr) to reach Venus or Mercury.