APOD.pl: astronomiczne zdjęcie dnia

Opis: Why does this large crater on Mercury have two rings and a smooth floor? No one is sure. The unusual feature called Vivaldi Crater spans 215 kilometers and was imaged again in great detail by ESA's and JAXA's robotic BepiColombo spacecraft on a flyby earlier this month. A large circular feature on a rocky planet or moon is usually caused by either an impact by a small asteroid or a comet fragment, or a volcanic eruption. In the case of Vivaldi, it is possible that both occurred -- a heavy strike that caused a smooth internal lava flow. Double-ringed craters are rare, and the cause of the inner rings remains a topic of research. The speed-slowing gravity-assisted flyby of Mercury by BepiColombo was in preparation for the spacecraft entering orbit around the Solar System's innermost planet in 2026.

Jutro: dusty heart

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Autorzy i wydawcy: Robert Nemiroff (MTU) i Jerry Bonnell (UMCP)
NASA Official: Amber Straughn obowiązują określone prawa.
Polityka Privacy, Accessibility, Notices;
Serwis prowadzony przez: ASD w NASA / GSFC,
NASA Science Activation
oraz Michigan Tech. U.

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