Kepler
Si certus es dubita
A real life science thriller is playing out as we speak.
A landing on Comet 67P/Churyumov-Gerasimenko was confirmed at about 1605 GMT.
There were cheers and hugs at the control room in Darmstadt, Germany, after the signal was confirmed.
It was designed to shine a light on some of the mysteries of these icy relics from the formation of the Solar System.
The landing caps a 6.4 billion-kilometre journey that was begun a decade ago.
The lander sank about 4cm into the surface, suggesting a relatively soft surface.
But shortly after, scientists confirmed that the harpoons, designed to fasten the spacecraft to the ball of ice, did not fire as intended.