Are antarctica and alaska the coldest places on earth?

No, Antarctica and Alaska are not the coldest places on Earth.

The coldest place on Earth is the East Antarctic Plateau, where temperatures have been recorded as low as -89.2°C (-128.6°F) at the Soviet Union's Vostok Station on July 21, 1983.

Alaska, on the other hand, has a much milder climate, with average temperatures ranging from -30°C (-22°F) in the winter to 20°C (68°F) in the summer.