article_snippet.sent: But it is unusual, because so far such activity has only been spotted on the day-side of the comet - not the night, like this.
article_snippet.sent: As the comet gets closer to the sun, the comet surface gets warmer, causing frozen gases to erupt from the surface, carrying dust particles.
article_snippet.sent: In The first image, taken at 7:13am BST (2:13am EST) on 12 March, the comet can be seen with several rays of dust illuminated by the sun, while the dark underside shows no such features.
article_snippet.sent: How or why the activity occurred in the dark region of the comet, though, is not yet understood.
article_snippet.sent: In the first image (left), the comet can be seen with several rays of dust illuminated by the sun, while the dark underside shows no such features.
article_snippet.sent: This recent image shows the small lobe of comet on the left, and This recent image large lobe on the right .