NASAのインスタグラム(nasa) - 12月3日 04時56分

What was the fate of #Comet #ISON? Scientists are still unsure. There is no doubt that the comet shrank in size considerably as it rounded the sun and there's no doubt that something made it out on the other side to shoot back into space. The question remains as to whether the bright spot seen moving away from the sun was simply debris, or whether a small nucleus of the original ball of ice was still there. Regardless, it is likely that it is now only dust.
By monitoring its changes in brightness over time, scientists can estimate whether there's a nucleus or not, but our best chance at knowing for sure will be if the Hubble Space Telescope makes observations later in December 2013.
In this time-lapse image, Comet ISON comes in from the bottom right and moves out toward the upper right, getting fainter and fainter. This image is from the ESA/NASA Solar and Heliospheric Observatory. The image of the sun at the center is from NASA's Solar Dynamics Observatory.
Image Credit: ESA/NASA/SOHO/SDO/GSFC
#nasa #space #cometison #stars #astronomy #universe #solarsystem #hubble #sdo

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