Temerature arround in space??? any astronomer or physics master...?

Althogh absolute zero is -273 degrees, Centigrade, (which equals 0 degrees absolute, or Kelvin) the microwave radiation left over from the singularity which created the universe (often termed "the big bang", although it was far from big, and ther was no bang, because there ws no matter for many thousands of years) causes the temperature to be 2.7 degrees absolute, in all directions, to within 1 part in 100,000 (except for stars, of course). Vacuum has nothing to do with temperature; a couple of thousand kilometres/miles above the surface of Mercury, the temperature is hot enough to melt lead, although it is a hard vacuum.