What is the metric base unit for temperature? for area?

For temperature:  Kelvin

For area:  square meter

Explanation:

The International System of Units, or SI is the current international standard metric system and is also the system most widely used around the world.

For temperature the base unit is Kelvin. It is defined to be the absolute temperature scale.  It is defined as the fraction 1/273.16 of the thermodynamic (absolute) temperature of the triple point of water.

A square meter (m²) is the basic surface unit in the International System of Units for area. It is the area within a square whose sides measure one meter.

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

hope this !