Q2343-BX418 is a young, low-metallicity dwarf galaxy located about 10 billion light years away from Earth.
[2] In July 2018, new research was published suggesting that the galaxy was surrounded by a massive halo of diffuse gas 150,000 light years in diameter, about 10 times the size of the galaxy itself.
The halo was measured to be giving off light in the Lyman-alpha line, an ultraviolet wavelength.
[3] By measuring the halo's spectra using the Keck Cosmic Web Imager at the Keck Observatory, the researchers found that the galaxy is surrounded by a roughly spherical outflow of gas.
[4] Steidel's team had studied the galaxy before using other instruments at the Keck Observatory.