What is the fastest speed of anything in universe?

Answer 1

The fasted "known" speed in the universe is the expansion of the universe itself, at about 74km/s per 3m lightyears. That is incredibly fast. The fastest obseved would be light at of course, lightspeed, or rougly 300,000,000m/s.

Answer 2

In a vacuum, light and all forms of electromagnetic energy travels at "c", which is 3 x 108 m/s. The discovery that this was the absolute speed limit independent of the observer is one of the core principles of relativity.

Answer 3

http://www.aerospaceweb.org/question/performance/q0023.shtml

you can find it here.

it was Helios 2 space probe reached 252,792 km/h, the fastest man-made object ever travelled.