I live in canada and one friend of mine is a scientist and i asked him that can we ever reach -273c. he says:

He says: no it is just a word it does not exist the temperature -273c does'nt exist. the temperature level is only -270 celsius. and he told me that see the universe is very very big if u eastmate it in 2012 there are not much molecules left only few of them r there but they stop moving because of the temperture -270c and also there are not much stars in outer space it's half empty......so he said our meaursement says that
-270 celsius is the point where all molecules stop moving. but the universe still has to expand a little bit.....and then after that universe will automatically stop expanding and there will be no stars no molecules.

the answer above is wrong. Absolute zero is a temperature that can never be reached. we can get incredibly close to it but we can NEVER get to it exactly. this is due to the fact that an atom at absolute zero will have no vibrational motion (i.e: it has zero energy) and obviously an atom cant have zero energy! so the universe will never get to absolute zero either!

Check out the 'heat death' of the universe

You're wrong. Absolute zero, 0 Kelvin, is -273.15 degrees Centigrade / Celsius.

The current world record was set in 1999 at 100 picokelvins (pK), or 0.000 000 000 1 of a Kelvin, by cooling the nuclear spins in a piece of rhodium metal.

So... We've reached and surpassed -273 C some time ago.

Wow its crazy what science is at with the universe and its oddly strange how the universe never stops growing.