AsteroidsProbability theoryEarth (Planet)Markov processesPlanetsThe discovery process of Earth-approaching asteroids is formulated as a periodic sampling problem from an urn with replacement. It presumes as unc
Here we attempt to estimate the answer to a simple question: How many hydrated asteroids should we expect to find in the NEO population? A promising approach, used below as well as by previous studies, is akin to the famous Drake equation approach for estimating the number of civilizations in...
A smaller number of satellites turn their "eyes" toward space, where they capture magnificent vistas of stars, planets and galaxies and scan for objects, such as asteroids or comets, that could be heading for a collision course with Earth....
Asteroids: These are rocky remnants from the early formation of our solar system about 4.6 billion years ago. Most asteroids are found between the orbits of Mars and Jupiter in what’s known as the asteroid belt. They can range in size from just a few feet to hundreds of miles in diamete...
There are many types to choose from, and many price ranges to consider. How do you know which one is best for you? How can you be sure that you won't be disappointed when you take your new telescope out to see the stars? In this article, we will examine how a telescope works...
What planets are after the asteroid belt? What planets are before the asteroid belt? How many different types of asteroids are there? What is the largest asteroid belt? How are asteroids usually discovered? How big are meteors in the asteroid belt? What is the largest asteroid in the main...
What do asteroids, meteors, and comets have in common? What are S-type asteroids? What are C-type, S-type and M-type asteroids? How do the C-type and S-type asteroids differ? How many S-type asteroids are there? How many different types of asteroids are there? What are the differen...
1. Mass of the asteroid Astronomers most commonly describe asteroids by their size, but what really matters is the mass. That is the asteroid's volume times its density. Astronomers assume that quite significant differences exist in the density of different types of asteroids. Carbon-rich asteroid...
There are almost as many ways to collect as there are different meteorites. I have a good friend who only owns oriented meteorites; another whose entire collection consists of meteorites he has found himself. A colleague of mine in Phoenix specializes in meteorites from our home state of Arizona...
there is an accumulation of debris from rockets, satellites, and other items that have created what theU.S. Geological Surveyhas aptly called a "cosmic junkyard." The trouble is, this space junk doesn't just float off into the unknown, never to be seen again. Many of these items can bu...