Elon Musk, the founder of SpaceX, tweeted a video showing a series of failed landing attempts by his falcon rocket.
Musk founded SpaceX in 2002 to reduce the cost of space travel, and the main idea he had for it was the reuse of parts in a rocket which traditionally were thrown off after lifting off from the Earth.
The difficult part however was to make the rocket land back on surface 'in one piece.'
The company achieved this feet in December 2015, and since then have made several successful landings. But it came at a cost, Musk posted a video showing all the failed attempts that went into reaching this stage.
The video will prompt you to think how difficult and revolutionary the achievements of SpaceX have been.