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From between ten thousand years and one million years ago, and with a diameter of one km (0.62 mi) or more. The largest in the last one million years is the 14-kilometre (8.7 mi) Zhamanshin crater in Kazakhstan and has been described as being capable of producing a nuclear-like winter. [11]
As the trend in the Earth Impact Database for about 26 confirmed craters younger than a million years old shows that almost all are less than two km (1.2 mi) in diameter (except the three km (1.9 mi) Agoudal and four km (2.5 mi) Rio Cuarto), the suggestion that two large craters, Mahuika (20 km (12 mi)) and Burckle (30 km (19 mi)), formed only ...
The Earth Impact Database is a database of confirmed impact structures or craters on Earth. It was initiated in 1955 by the Dominion Observatory , Ottawa, under the direction of Carlyle S. Beals . Since 2001, it has been maintained as a not-for-profit source of information at the Planetary and Space Science Centre at the University of New ...
Pieces as large as 20 millimeters (1 in) were found on Crater Rim Drive while 0.3 m (1 ft) blocks hit the crater overlook area. [15] This was the first explosive eruption of Halemaʻumaʻu since 1924, and the first lava eruption from the crater since 1982. [16]
Earth's moon is roughly 2,000 times more massive than Mimas. An internal ocean's presence implies a strong heat source inside Mimas that turned ice into an ocean.
Mimas's low density, 1.15 g/cm 3, indicates that it is composed mostly of water ice with only a small amount of rock, and study of Mimas's motion suggests that it may have a liquid ocean beneath its surface ice. The surface of Mimas is heavily cratered and shows little signs of recent geological activity.
“It’s quite easy with Google Earth these days to go on and find structures that are circular or semi-circular in origin,” Gordon Osinski, ... Of the world’s roughly 200 impact craters, 31 ...
The similarity between Mimas's appearance and the Death Star in Star Wars due to the large size of Herschel has often been noted, both in the press and in NASA/JPL press releases. [6] [7] This is a coincidence, however, as the crater's similarities were not discovered until 1980 after Voyager 1 gained line of sight, three years after the film ...