... Churyumov-Gerasimenko, I suppose? ...

1h ago 16:10

Harpoons fired, ice screws in, data being received. “We are on the comet!” says Stephan Ulamec, Philae Lander Manager, DLR.

1h ago 16:09

Confirmed: Landing has taken place!
“We see the lander sitting on the rock.” - Andrea Accomazzo, ESA.

1h ago 16:07

Landing!
Judging by the scenes in mission control we have success! The Philae lander is down. The European Space Agency have tonight made history by landing on comet 67P/Churyumov-Gerasimenko.
Just waiting for official confirmation. Someone must call it before I will totally believe it.

Follow the mission's landing live coverage here.

Philae’s shot of its mothership shortly after separation. Photograph: ESA/Handout/ESA/Handout/Corbis

The Guardian covers the whole story here.

Rosetta project scientist Matt Taylor, seen here with Monika Jones, the presenter of the livestream, sporting a colourful shirt. Note also the Rosetta tattoos. Photograph: C Carreau/Esa

But all this leaves me wondering... what about the butterfly effect?...
Well, maybe it doesn't apply in outer space, where butterflies haven't been found... yet.

The Philae lander en route. Photograph: Esa