A slot pair, or two slots, is
required for a takeoff and landing.
Not exact matches
This results in less lift
for an airplane,
requiring a longer runway to achieve
takeoff and a reduction in climb performance.
SpaceShipTwo's rockets will burn nitrous oxide — but only briefly — as the spaceship would
require no fuel
for takeoff, reentry and landing.
This isn't to say that SpaceX couldn't develop and test the various, exceedingly complex systems
required for a Martian landing and
takeoff, but 10 - 12 years is a pretty tight timeline.
Most states chose a very long
takeoff, with the bar staying low
for the first six or eight years, followed by a sharp upward thrust, with breathtaking gains
required after that.