The sun’s only visible during a solar eclipse

The given blank can be filled with corona.

Explanation:

The Moon moves in between the Earth and the Sun in a solar eclipse. When this takes place, a segment of the light of the Sun gets blocked. During a total eclipse of the Sun, the corona of the Sun can be witnessed shining in all the orientations surrounding the Moon. The only time when the corona of the Sun can be witnessed is during a total solar eclipse. Colorful lights from the chromosphere of the Sun and the solar prominences are also visible at the time of a total solar eclipse.

the transfer for conduction is the heat transfering from the liquid to the spoon

the transfer for convection is the heat rising from the liquid to the air

the transfer for radiation is the heat going through the sides of the cup and to the air

at least that is what i would do