91av

About time: Why does time's arrow fly only one way?

5 October 2011

We can move through space in any direction we like – but time is a strictly one-way street, and physicists still can't tell us why

About time: Countdown to the theory of everything

5 October 2011

General relativity and quantum mechanics explain time in drastically different ways – reconciling them is the key to a theory that will encompass both

Did our cosmos exist before the big bang?

10 December 2008

What if our universe didn't emerge from nothing, but is a recycled version of one that went before? Anil Ananthaswamy investigates

What makes the universe tick?

19 November 2008

If you want to understand the universe be prepared to get your moments in a muddle, advises Michael Brooks

Is time an illusion?

16 January 2008

The greatest trick the universe ever pulled was convincing us that time exists. Amanda Gefter breaks the spell

You are made of space-time

9 August 2006

Physical particles may seem very different from the space-time they inhabit, but what if the two are one and the same thing? 91av investigates

Cosmic trigger

8 October 2004

We may never know what kicked the universe into being, but there are certainly some ingenious suggestions out there

The world turned inside out

20 March 2004

Was the big bang the start of everything? Far from it, reports Amanda Gefter, it may merely have been a portal from a looking-glass universe

The hollow universe

26 April 2002

You're holding a magazine. It feels solid; it seems to have some kind of independent existence in space. Ditto the objects around you—perhaps a cup of coffee, a computer. They all seem real and out there somewhere. But it's all an illusion. Those su

Beyond space and time

16 May 1997