Archive |

By jagrier on December 22, 2017 in

We see so many craters from the perspective of a bird, flying directly above. But what are impact craters like from the ground, up close and personal? First of all, it can be hard to identify an impact crater from the ground, even when you are very nearby. This is because we are so used […]

By jagrier on November 17, 2017 in

Here at CosmoQuest we spend a lot of time looking at craters. It is a job that only people can do – not computers (yet, anyway). Scientists have been trying to write programs that will effectively identify and count craters, but they have met with only limited success. As noted, craters are not always perfectly […]

By jagrier on October 27, 2017 in

Impact craters go through an aging process. They start out new and pristine, but they gradually degrade. This is because impact events are happening all the time, and the craters they create are eventually bashed up by other impact events. The very smallest impacts – the micrometeorite impacts – are constantly wearing down the lunar […]

By jagrier on October 20, 2017 in

Impact craters come in all sizes, because impactors come in all sizes. At the smallest size are microscopic particles of dust. They may be tiny, but as noted in the last post, they are traveling very fast, and so they impact with plenty of energy. On a world like the Earth, little bits of dust […]

By jagrier on October 13, 2017 in

It turns out that “rocks running into other rocks” is a pretty complicated process. The most important aspect of the process is how much energy is involved. The two factors in finding the energy of an impact are (1) how much mass is in the impactor, and (2) how fast it is moving. The bigger […]