SpaceDid a 'sleeper' field awake to expand the universe? A field called quintessence that has been lurking around since the big bang might now be causing the expansion of the universe to accelerate ¿ìè¶ÌÊÓÆµ
SpaceRoger Penrose: Non-stop cosmos, non-stop career The mathematician and self-proclaimed incurable optimist talks about his cameo in an Oscar-nominated movie and why he has no time for string theory Opinion