An Etymological Dictionary of Astronomy and Astrophysics
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A huge gaseous nebula (≥ 50 kpc) lying at high → redshifts (z ~ 2-6) and strongly emitting radiation due to the → Lyman alpha line (luminosities of  ≥ 10⁴³ erg s^-1) of hydrogen gas. Also called Lyman alpha blobs, they are thought to lie in massive (M ~ 10¹³ solar masses) → dark matter halos, which would subsequently evolve into those typical of rich → galactic clusters.

→ Lyman; → nebula.