Asteroids Near Earth
Asteroid Ida (56km x 24km x 21km) and its moonlet Dactyl, photographed by the NASA probe Galileo
The phrase "Near Earth Asteroids" is most popular in the general public, but has been superceded in the scientific community by the phrase "Near Earth Objects" and given the acronym NEO, in order to distinguish between:
asteroids -- the kinds of bodies which originated in the inner solar system, usually rocky, vs.
comets -- which originated in the outer solar system but were captured by the inner solar system -- and may look like asteroids at first glance from a distance -- whereby their surface volatiles have boiled off long ago, so they no longer have a tail, but are probably rich in water, carbon, and other volatiles (especially nitrogen) under the surface, and may be finer and softer in texture, even powdery.
Efforts to introduce the terminology "NEO" to the general public have not resulted in broad assimilation, at least not yet, whereby many people refer to everything as "near Earth asteroids" but say "huh?" when we refer to NEOs, so for practical purposes, many of us say "NEO" when talking with professionals but only "near Earth asteroids" when talking with the general public, especially in a brief encounter with the latter.
On this website which reaches out to the general public, I will sometimes keep things simple and easy by calling things "asteroids" rather liberally for the most part, rather than be pedantic with NEO everywhere. Nevertheless, it is important to introduce people to the acronym NEO because there are significant differences. The term NEO has gotten around a lot on the internet, and even some journalists have properly complied with this.
In this categorization, "NEO" encompasses everything -- asteroids near Earth, comets, even space junk in some circles. So, asteroids near Earth are included in the group of objects called NEOs, but cometary derived NEOs in some professional circles are technically not "asteroids" in strict circles.
The vast majority of strict "asteroids" originated in the asteroid belt between Mars and Jupiter, but can be any body which originated in the inner solar system, usually rocky bodies which are usually depleted in volatiles.
Occasionally, there are the acronyms NEA for Near Earth Asteroid (vs. NEO), and MBA for Main Belt Asteroid.
The subsections of this section are all listed below.
spacesettlement.com > Asteroids, Near Earth Objects (NEO)
Additional, children pages of this current parent page:
Asteroids, Near Earth Objects (NEO) :
Overview of NEOs
NEO Location Classes
Meteorites: Samples of NEOs
Origins of Meteorites
Compositions of Meteorites
Falls vs. Finds Caveat
Reflection Spectroscopy of NEOs
Probes to Asteroids, Comets
Phobos, Deimos (Mars moons)
Giotto (Halleys Comet)
MBA Galileo flybys
Deep Space 1
Hayabusa NEA Sample Return
Rosetta Comet Lander, Orbiter
Deep Impact (Comet)
Dawn to MBA Vesta, Ceres
Fobos-Grunt (failed, Phobos)
OSIRIS-REx Asteroid Probe
Obama-Keck asteroid retrieval
Mining Asteroids and NEOs
Asteroid Lander Techniques
Impact of Earth by a NEO
Discovering New NEOs
If you choose to submit feedback, then I wish to thank you in advance.
After you click on Submit, the page will jump to the top.
Reasons to do something yourself:
- It will help save life on our special planet -- be part of the solution in your generation.
- It will create and secure a better future for your children and grandchildren.
- It could be an interesting, cool, and a fun adventure for your life!
You can join us and volunteer to help out,
... or ...
If you're short on time, you can just donate. For money, please contact Mark Prado via his personal website at www.mark-prado.com.
If you really much prefer to send by cryptocurrency, then you can donate into a wallet of any of our cryptocoins, though this is our least preferable way to receive donations ..., so please donate this way only if it's really much more convenient or feasible for you. The wallets are included in my cryptocoin critiques opinion page.
... or ...
Suggest this website to other people and organizations.
PERMANENT needs a PHP / MySQL (actually, MariaDB) programmer. Are you a PHP / MySQL programmer interested in getting into space development as a career, or already working in space development? Or do you know somebody else who might be interested?
This is a volunteer, unpaid role at this point in time. A limited paid role would be considered on a tight budget, such as for at least bug fixing with some minor improvements, and/or a security review of our code before it goes online publicly. If you or one of your friends or associates may be interested, please send an email to spaceprogrammer at ... of course this domain.
To get updates on PERMANENT (occasional, not frequent), get on our mailing list.
For general or specific e-mail regarding PERMANENT, please use our Feedback page.
Leave information about yourself in our people, companies, and organizations database.
If you are interested in hiring our expertise, anywhere in the world, please contact us.
We have people in the USA and Thailand, and can travel or consult by internet.
You can call anytime, 24/7, at +66-8-1135-7977
Text by Mark Prado, Copyright © 1983-2023, All Rights Reserved.
Many website artistic design elements by Sam Fraser, Copyright © 1999-2023, All Rights Reserved.
Except where specifically stated otherwise,
Copyright © 1983-2023 by Mark Evan Prado, All Rights Reserved
P rojects to E mploy R esources of the M oon and
A steroids N ear E arth in the N ear T erm
P rojects to E mploy R esources of the M oon
A steroids N ear E arth
in the N ear T erm
This website has a lot of text content, so here are some suggestions on how to navigate and also recognize pages you're seen already vs. still unseen pages in the SiteMap.
There are 2 ways to browse this website:
- The SiteMap page.
The pulldown menu and the SiteMap are the same tree of pages and links. The pulldown menu offers + and - for expand and collapse sections/subsections/sub-subsections... of the tree, sometimes multiple levels, whereas the SiteMap has everything expanded with no + or - expand and collapse options so the SiteMap is much longer, compared to the pulldown menu if not fully expanded. You may just choose which of the two formats you prefer at a particular time.
The SiteMap colors links red which you have already visited, vs. normal blue for still unseen. It is convenient to browse the SiteMap in one tab or window, and opening pages in other tabs/windows (Ctrl-click or right-click), such as browsing the whole SiteMap to skip pages you've already seen and to choose to open pages you haven't read yet.
The pulldown menu doesn't change the color of seen pages, unfortunately, unlike the SiteMap. However, using the pulldown menu, you can quickly browse the list of sections and other pages without leaving the page you're on. The SiteMap is a separate page of its own.