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Despite its tremendous bulk, the cluster was hidden until astronomers looked for the distortions it created in the cosmic microwave background, the oldest light in the universe. This light was emitted when ions and electrons first combined to form atoms just after the Big Bang, and has been traveling through the rest of the matter in the universe for the last 13.7 billion years or so to reach telescopes on Earth. As the light passes through massive galaxy clusters, it can get distorted in a phenomenon called the Sunyaev-Zel’dovich effect.
Because the cluster is so far away, astronomers see it as it appeared 7 billion years ago, when the universe was half its current age and before the solar system even existed. Even then, the cluster was almost as massive as the nearby Coma Cluster of galaxies, which is one of the densest known. Since then, the cluster should have quadrupled in size, astronomers inferred, making it one of the most massive clusters in the universe.
...cosmic microwave background, the oldest light in the universe. This light was emitted when ions and electrons first combined to form atoms just after the Big Bang, and has been traveling through the rest of the matter in the universe...
Originally posted by pryed -eyed-one
great find. i truly believe the universe is infinate in all dirrections and all dimensions, a vast limmetless array of changing forms on all scales forever, alive and thinking forever, for without perception and the ability to percieve then in my opinion nothing exists at all.
Originally posted by new_here
reply to post by anon72
...cosmic microwave background, the oldest light in the universe. This light was emitted when ions and electrons first combined to form atoms just after the Big Bang, and has been traveling through the rest of the matter in the universe...
Wouldn't the 'oldest light in the universe' already be well beyond existing matter in the universe and not traveling thru it, unless the matter existed before the light began it's journey?
Originally posted by Electric Crown
Originally posted by new_here
reply to post by anon72
...cosmic microwave background, the oldest light in the universe. This light was emitted when ions and electrons first combined to form atoms just after the Big Bang, and has been traveling through the rest of the matter in the universe...
Wouldn't the 'oldest light in the universe' already be well beyond existing matter in the universe and not traveling thru it, unless the matter existed before the light began it's journey?
stars are made up of matter, therefore matter existed before the first stars formed
Shouldn't the oldest light always meet up with darkness as it travels outwards in all direstions? (Please don't take this as argumentative-- I seek to understand, to 'wrap my brain around this!)