Using the Hubble Space Telescope, an international team of astronomers led by researchers at the Cosmic Dawn Center in Copenhagen, have investigated a galaxy seen almost 11 billion years back in time. Contrary to typical observations, the galaxy was discovered not by the light it emits, but by the light it absorbs. The galaxy itself evades observations, but has at least one nearby companion. Together, these galaxies comprise an early group which may later evolve to resemble the Local Group in which we live.
When we see things, we see them because they either emit light—such as the sun or a flashlight—or because they reflect light emitted by someone else—such as the moon or a bicycle.near and far. Galaxies emit light across the full electromagnetic spectrum, and different telescopes can then detect different kinds of light.
Depending on the exact wavelengths where we see the"holes," as well as exactly how much light is missing, we can then deduce various physical characteristics of the foreground galaxy. Nevertheless, that's what Johan Fynbo, astronomy professor at the Cosmic Dawn Center in Copenhagen, likes to challenge himself with.
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