19 oktober 2017

Planeetachtig object is in z’n jeugd zo heet als een ster geweest

A four-stage sequence (left to right) showing the possible extreme temperature evolution for WISE J0304-2705. When young the object was as hot as a star, shining with a temperature of at least 2800 degrees C for about 20 million years. After 100 million years or so it had cooled to 1500 degrees C, and by a billion years its temperature was around 1000 degrees C. The final stage is billions of years later, when WISE J0304-2705 had cooled to its current planetary temperature of 100-150 degrees C.

A four-stage sequence (left to right) showing the possible extreme temperature evolution for WISE J0304-2705. When young the object was as hot as a star, shining with a temperature of at least 2800 degrees C for about 20 million years. After 100 million years or so it had cooled to 1500 degrees C, and by a billion years its temperature was around 1000 degrees C. The final stage is billions of years later, when WISE J0304-2705 had cooled to its current planetary temperature of 100-150 degrees C.

Astronomen hebben een zeer koele bruine dwergster ontdekt, met een temperatuur van slechts 150 graden Celsius. Maar het is ook vastgesteld dat dit object, dat

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