Mercury has a diameter of about 4880 kilometers (3030 miles), and the smallest feature visible in this color image is about 10 kilometers (6 miles) in size.
If the work was published without a notice or if the copyright has expired, it is not in the public domain. Works published between 1964 and 1977 - When published with notice, it has copyright protected for 28 years for first term, with an automatic extension of 67 years for the second term for a total of 95 years.
It's a Wonderful Life entered the public domain by accident. In 1946, when the movie was filmed, U.S. copyright protection lasted 28 years and could be renewed for another 28 years by filing some paperwork and paying a nominal fee. However, Republic Pictures, the original copyright owner and producer of Wonderful Life, neglected to renew the 1946 copyright in 1974.