The European Space Agency is making a very big announcement tomorrow at 16:00 UTC. Nobody knows quite exactly what, other than it's at least related to an extra-solar planet. But the rumour mill is in over drive - an Earth-like planet?

Who knows for sure, but it seems pretty special, a lot of hype is building - a lot more than when they announced the planet with half the mass of Uranus orbiting Gliese 876 - until that point all the planets had been huge, tens and even hundreds times more massive.

I'm thinking this has got to be a terrestrial planet for sure.

Update on the day: Full story here, terrestrial planet with 5 times the mass of the Earth - and get this - it was detected 25 000 light years away.