I wasn't actually aware either of the Gosse Bluff comet impact crater, or the Henbury meteorite craters before our trip, but we serendipitously stumbled upon both.
Gosse Bluff is the 5km diameter remnant of the central cone of a giant 22km crater that's since been eroded. It is believed to have been formed 140 million years ago when a 500m diameter comet hit. It's just off Namatjira Drive, 175km west of Alice Springs. We drove right inside and surveyed the scene.
Then, next day just off Ernest Giles Rd, a similar distance from Alice Springs but to the south west of it, lo and behold, the Henbury meteorite craters.
These are only 4000 years old, and range in size up to 180m diameter and 15m deep. We walked around and inside some, and I looked up to see if any more were coming!
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