The Orbit will only be open until 12 August.

BBC: Orbiting views of Olympic London

In July 2013, the Orbit is expected to re-open as a ticketed attraction with a cafe that can also host private functions.

BBC: Orbiting views of Olympic London

If Apophis passes the earth at a distance of exactly 18, 893 miles it will open a "gravitational keyhole" causing it to enter a new orbit that would put it on a direct collision course with earth seven years later.

CNN: Space's threat to civilization