Temperature is the effect of molecules moving, the faster they move, the hotter the temperature. When nothing is moving, it is absolute zero, you won't be able to get colder if you tried. On the opposite scale, the temperatures can reach to many millions. the Sun for example is about 6,000°C on the surface but at the core, it can be 15 million °C.
The majority of life as we know exists at the lower end of the scale. There are life forms known as extremophiles that have been discovered to survive at extremely high temperatures, 110-120°C, that is hot enough to boil water. It is temperatures that humans would boil away as we are 80% water. Those life forms are extremely simple, nothing more than bacteria. Other extremophiles have been discovered at temperatures of -20°C in frozen ice. Wiki
Lets move back to the original subject. Where is the coldest place in the Universe, we've already covered Coldstars, stars that are so cold that some are cold enough touch. You still wouldn't want to get anywhere near them as they are still radioactive and will kill you. One such star I covered was Wise 0855-0714 in the constellation of Hydra.
Before the Big Bang, there was nothing except what the universe grew out of. The temperature in the surrounding area and the rest of the universe would be absolute zero. As the Big Bang started, the universe would have started to heat up and the temperature of the universe would never be the same again. The temperature may well return back to that state when the Universe is over but that's not for an unimaginably long time.
All the matter in the universe has probably only spread to less than one percent of the size of the universe. Where the matter hasn't reach yet would be absolute zero. This is not fudge but what it probably true, the coldest part of the universe is where no matter exists.
The Boomerang Nebula in the constellation of Centaurus in the southern hemisphere is widely considered to be one of the coldest places in the known universe. It is a mere one degree above absolute zero. The nebula has a star that is becoming a planetary nebula as it looses it gas. The star will become a white dwarf or condensed star which will light up the nebula. Over the past 1,500 years, the star at the centre has lost one and half times the mass of our star. N.A.S.A.
Despite being the closest planet to the Sun, it also has one of the coldest environments in . In the shade, the atmosphere reaches to a cold -160°. The reason for such a large difference in Mercury's temperature is that the planet lacks an atmosphere like Earth or Venus to keep it warm. The temperature of Mercury in the shade is lower that the average temperature of Pluto which is furthest (ex-) planet from the Sun.
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