Space is cold because it is mostly empty, so there isn’t enough matter to gain and retain heat.
But heat is still a problem in space, which is why space suits for EVA are designed with insulation and cooling to keep the wearer from getting too hot in the sun or too cold in the shade. There is also a cooling solution for space craft and stations that transfer heat from the hot side to the cool side to regulate the temperature. They also have tinted windows to help block harmful UV radiation.
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