Stephen Hawking en la página de la NASA.
Unwell Hawking misses 70th birthday celebrations en la BBC
Stephen Hawking celebrates 70th birthday with cosmology conference.
Stephen Hawking turns 70.Scientist who was diagnosed with motor neurone disease at 21 to deliver rare public lecture in Cambridge
Stephen Hawking to give 70th birthday lecture 'A brief history of mine'. Hawking's rare public lecture on Sunday will be the star turn of a symposium in Cambridge celebrating his work.
