A war of words has erupted on Twitter between billionaire Jeff Bezos and Elon Musk.
Both entrepreneurs are hoping to be the first to commercialise space travel by developing reusable rockets that can land back on Earth.
Yesterday, Jeff Bezos came closer to that goal after his company, Blue Origin, successfully landed a rocket at a launch site in Texas.
Bezos proudly tweeted: 'The rarest of beasts - a used rocket. Controlled landing not easy, but done right, can look easy.'
But the Space X founder immediately hit back at the achievement, with: 'Not quite 'rarest'. SpaceX Grasshopper rocket did 6 suborbital flights three years ago and is still around.'
The Grasshopper made eight flights and landings before it was retired in late 2013, but the highest it ever flew was around half a mile. Daily Mail Read More>>>>>
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