New research suggests that our trusty companion may not have been the Earth's first, but formed from several smaller moonlets.
Politician Douglas Carswell has been arguing with scientists about what causes the tides. We've figured out who's right.
A little trig helps to find the relative distance to the Sun and Moon.
Some of the things I overheard at Stephen Hawking's 70th birthday conference did make me wonder whether I hadn't got the wrong building and stumbled in on a sci-fi convention. "The state of the multiverse". "The Universe is simple but strange". "The future for intelligent life is potentially infinite". And — excuse me — "the Big Bang was just the decay of our parent vacuum"?!
This is the first part of the lecture given by Astronomer Royal Martin Rees at Stephen Hawking's birthday symposium.
This is the second part of the lecture given by Astronomer Royal Martin Rees at Stephen Hawking's birthday symposium.