Lyman-alpha, typically denoted by Ly-α, is a spectral line of hydrogen in the Lyman series. It is emitted when the atomic electron transitions from an n = 2 orbital to the ground state, where n is the principal quantum number. From Wikipedia
JADES-GS-z13-1, observed 330 million years after the Big Bang, provides evidence of early cosmic reionization with strong Lyman-α emission.
