Once you have seen the museum (or you can do that last), you can go out to the site of the crater. An observation platform gives you the possibility to see it from a closer view. There is no way to walk down into the crater itself.
Information on a sign said that 50,000 years ago, a meteor that was only 45.7 meters or 150 feet in size formed this crater in Arizona that is 1.6 km or 1 mile across.
Along the crater rim, there are walking paths, so you are able to look down into the crater. It is not allowed to enter the crater itself, though. Notice how small the people look when standing at the rim of the crater.