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Which got me wondering about the International Space Station that is circling the globe at an altitude of approximately 220 statute miles, or about 350 kilometers to 400 as we keep saying that it is in micro gravity.....is this due to orbital speed?
The ISS is in low Earth orbit (LEO). You can track it via http://www.isstracker.com/
The station is in orbital freefall, so any objects or crew on board appear to be weightless relative to the station.
This competition was announced before the SLS Orion EM2 was put back to 2023. Would the SLS be considered flight ready to launch the mission in time for 2024?
The obvious alternative is SpaceX. However, they have their own plans. SpaceX have made it known that they intend to send humans to Mars in the 2020s, but there have been few official details published so far.
There have been some cryptic mentions that SpaceX plan to unveil their "Big Falcon Rocket" and their plans for it by the end of the year. For example, there is a brief mention towards the end of this article: http://www.nasaspaceflight.com/2015/10/ … uman-mars/
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