All posts by jagrier

By jagrier on January 5, 2018 in

As you know from having searched for impact craters on images here at CosmoQuest, some craters are are easier to spot and measure than others. One of the things that makes a crater easier to identify is a prominent shadow cast from the rim. Such shadows are created when the source of illumination (the sun) […]

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 December 15, 2017 in

In previous posts we’ve discussed how the very smallest craters have “simple” shapes, and that the somewhat larger craters have “complex” shapes. You may have been wondering why that is, and what we mean by “larger” anyway? How large is large? Well, that turns out to be dependent on the planet where the crater is […]

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 […]