![]() So how much energy does it take to deliver 1kg of payload to the ISS? First, think of kinetic energy (KE) – yes, you learned this at school. The SpaceX rocket comes in to land on the drone ship. The Saturn V rocket, at a cost of US$6 billion in 1969, was completely lost. The third stage burned for nine more minutes to send the astronauts towards the moon – again burning up on re-entry. It too was jettisoned and then burned up during its descent to Earth. The second stage burned for a further six minutes, taking the craft into near-Earth orbit. The first stage of the huge Saturn V rocket that launched them into space burned for about three minutes and then crashed into the ocean. Neil Armstrong and Buzz Aldrin walked on the moon while Michael Collins piloted the command module in lunar orbit. ![]() Think back to 1969 when the Apollo 11 mission delivered three astronauts to the moon. ![]() Most remarkably, the first-stage booster then landed on a ship (see below). On Friday 8 April 2016, SpaceX’s Falcon 9 rocket launched a mission to deliver a spacecraft called Dragon with its payload of supplies and experiments into a trajectory towards the International Space Station (ISS). ![]()
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