Astronomy Picture of the Day ·

A Double Ringed Basin on Mercury

The Astronomy Picture of the Day for October 7, 2009 is “A Double Ringed Basin on Mercury,” an image. It is credited to Credit: NASA / JHU APL / CIW. The original explanation runs about 189 words.

A Double Ringed Basin on Mercury
Credit: NASA / JHU APL / CIW Shown from science.nasa.gov. Not hosted by OpenOrbit.

From the explanation

“What caused the smooth floor inside the double ringed basin on Mercury? No one is sure.”

— APOD editors, October 7, 2009

Read the full explanation on science.nasa.gov

At a glance

Date
October 7, 2009
Type
Image
Credit
Credit: NASA / JHU APL / CIW
Copyright
No copyright notice on the entry. Check the credited institution’s own usage rules before reusing it.
Explanation length
About 189 words

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Source

Copy taken Oct 28, 2026, 2:39 AM EDT. The image and explanation belong to their creators. OpenOrbit is not affiliated with or endorsed by NASA.