A yellow emission line in the spectrum of this object led Norman Lockyer to propose the existence of helium.
A yellow emission line in the spectrum of this object led Norman Lockyer to propose the existence of helium. The protracted lack of certain features on this object last occurred during the Maunder Minimum, and those features generally increase and decrease in an eleven year cycle. The mean distance (*) to this object from Earth is equal to the astronomical unit, or au. Those previously mentioned features are this object's namesake spots and a sudden brightening of it are known as its flares. For 10 points, identify this star at the center of our solar system that can undergo an eclipse when the Moon passes in front of it.
A yellow emission line in the spectrum of this object led Norman Lockyer to propose the existence of helium.
the {Sun}