Pl i need all of these right for my test (i will vote u brainliest if you get them right) 1) what are the dark spots which appear from time to time on the sun's surface called? corona prominences solar flares sunspots 2) which of the following is the center of the universe according to the heliocentric model? earth moon mars sun 3) how can spectroscopy and infrared technology be useful in space? they can enhance speed by making spacecraft fuel more efficient. they can measure magnetic fields produced by astronomical bodies. they can provide an emergency escape to the astronaut from a space center. they can determine the elements that make up the surface of astronomical bodies.