Question

which type of star is very bright but cool in temperature?
white dwarf
red giant
main sequence star
neutron star

Explanation:

Red - giants are large in size. Their large surface area allows them to emit a large amount of energy and be very bright, despite having a relatively low - surface temperature. White dwarfs are small and dimmer, main - sequence stars vary but are not typically both very bright and cool, and neutron stars are extremely dense and not characterized by being bright and cool.

Answer:

red giant