When the Sun 'leaves' the main sequence,

1. its luminosity and temperature both remain the same.

2. its luminosity and temperature both increase.

3. its luminosity decreases while its temperature increases.

4. its luminosity increases while its temperature decreases.

Question

When the Sun 'leaves' the main sequence,



1. its luminosity and temperature both remain the same.

2. its luminosity and temperature both increase.

3. its luminosity decreases while its temperature increases.

4. its luminosity increases while its temperature decreases.

anonymous · Answer

It expands towards red giant, so its luminosity goes up and surface temperature down.