How have astronomers formed their ideas about the layers of the sun?(1 point)

Question

Responses

making direct observations of the sun's layers
making direct observations of the sun's layers

observing all the layers during total solar eclipses
observing all the layers during total solar eclipses

developing mathematical models based only on known data
developing mathematical models based only on known data

using theoretical models combined with known data

Answer 1

all of the above