Question

Asteroids are between 1000 km and less than 10 m in diameter. What is the diameter of most asteroids?

Answer 1

Most asteroids fall within the range of sizes between 10 kilometers and 1000 kilometers in diameter.

Step-by-step explanation:

Most asteroids have diameters smaller than 1000 km.

The largest asteroid, Ceres, has a diameter just less than 1000 kilometers.

There are other asteroids like Pallas and Vesta with diameters of about 500 kilometers.

About 15 more asteroids have diameters larger than 250 kilometers.

The number of asteroids increases rapidly with decreasing size, and there are about 100 times more objects 10 kilometers across than there are 100 kilometers across.

Overall, most asteroids fall within the range of sizes between 10 kilometers and 1000 kilometers in diameter.

Answer 2

This question needs research to be answered. From the given information alone it can't be answered without making wild assumptions.

Ideally, you need to take a look at a distribution (or a histogram) of asteroid diameters, identify the "mode" of such a distribution, and find the corresponding diameter. That value will be the answer.

I am attaching one such histogram on asteroid diameters from the IRAS asteroid catalog I could find online. (In order to get a single histogram, you need to add the individual curves in the figure first). Eyeballing this sample, I'd say the mode is somewhere around 10km, so the answer would be: the diameter of most asteroid from the IRAS asteroid catalog is about 10km.