What is a heterogeneous mixture ?​

A heterogeneous mixture is a mixture with a non-uniform composition. The composition varies from one region to another with at least two phases that remain separate from each other, with clearly identifiable properties. If you examine a sample of a heterogeneous mixture, you can see the separate components.

In short :

It is the mixture that does not have the same proportions of its components in any of the samples. Example- Sand and water. Salt and oil. Ice cubes in drink.

no, the red giant is the hottest with 2.00.000.000 degrees celsius. while the white dwarf only 25,000 degrees celsius.