{"id":3314,"date":"2025-11-03T07:53:29","date_gmt":"2025-11-03T07:53:29","guid":{"rendered":"https:\/\/terrarara.com.br\/en\/?page_id=3314"},"modified":"2025-11-03T07:53:29","modified_gmt":"2025-11-03T07:53:29","slug":"universo-era-duas-vezes-mais-quente-ha-7-bilhoes-de-anos-mostra-estudo","status":"publish","type":"page","link":"https:\/\/terrarara.com.br\/en\/?page_id=3314","title":{"rendered":"Universe was twice hotter 7 billion years ago, study shows"},"content":{"rendered":"
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The relative positions of the background quasar (bright flare at 11 billion years ago), the foreground galaxy producing HCN absorption (7 billion years ago), and the observer (ALMA; Present day). (Keiko University)<\/figcaption><\/figure><\/div>
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Credibility<\/a>: 9<\/font>8<\/font>9<\/font>
#Universe<\/a><\/p>

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\r\n\tWhen you open a refrigerator, you expect it to be colder than the kitchen, right? Likewise, when astronomers look back at the Universe, billions of years ago, they expect it to be hotter than it is today<\/strong><\/p>

A group of Japanese scientists confirmed this very precisely, providing one of the best proofs yet of how the Universe evolved.\r\n<\/p>

\r\nWhat did scientists discover?<\/b>\r\n<\/p>

\r\nLed by student Tatsuya Kotani and professor Tomoharu Oka, from Keio University, in Japan, the team measured the temperature of the cosmic background radiation, which is like a “weak light” destroyed by the Big Bang, the great explosion that gave rise to the Universe.<\/p>

\r\nThis radiation is present throughout space.\r\n<\/p>

\r\nThey discovered that, 7 billion years ago, the temperature of the Universe was 5.13 degrees above absolute zero (a super low temperature, where everything is practically frozen), with a margin of error of just \u00c2\u00b10.06 degrees.<\/p>

\r\nThis is almost double the current temperature of the Universe, which is about 2.7 degrees above absolute zero.\r\n<\/p>

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\r\nWhy is this important?<\/b>\r\n<\/p>

\r\nThis discovery confirms a central idea of the Big Bang theory: the Universe is cooling as it expands, like a balloon that will get bigger and colder over time.<\/p>

\r\nThe further back we go, the hotter it should be, and this measurement measured exactly that.\r\n<\/p>

\r\nWhat makes this study special is its precision.<\/p>

\r\nScientists obtained data from the ALMA telescope in Chile and analyzed the light from a very distant quasar (a type of bright object in space).<\/p>

\r\nThis light, as it traveled through the Universe, interacted with the cosmic background radiation, leaving clues that allowed temperature to be measured extremely accurately.<\/p>

\r\nIt is the most precise measurement ever made for this time in the history of the Universe.\r\n<\/p>

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\r\nWhat does this mean?<\/b>\r\n<\/p>

\r\nThis discovery is like getting a weather forecast right.<\/p>

\r\nImagine the meteorologist says it’s going to rain, and when you see puddles forming, you trust the forecast more.<\/p>

\r\nLikewise, scientists have a model of the Universe, called the standard model, that makes a variation on how it should work.<\/p>

\r\nThis temperature measurement, which almost perfectly matched that of the previous model, gives more confidence that our understanding of the origin and evolution of the Universe is correct.\r\n<\/p>

\r\nAlthough we have already measured the temperature of the Universe in its earliest moments and today, this study fills an important chapter in the middle of this history, helping to confirm that we are on the right path to understanding how the Universe got here.<\/p>

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Published in 11\/03\/2025 07h53<\/em><\/p>\r\n

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Portuguese version<\/a><\/em><\/p>\r\n

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Text adapted by AI (Grok) and translated via Google API in the English version. Images from public image libraries or credits in the caption. Information about DOI, author and institution can be found in the body of the article.<\/p>\r\n\t\t

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Reference article:<\/p>\r\n\t\t\r\n\t\t\r\n\r\n\r\n