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Should one of these "extinction class" NEOs collide with the planet, the effects would be catastrophic. Many scientists think such an asteroid impact caused mass extinction 65 million years ago, and the Tunguska Event serves as a stern reminder of the odds.
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While the more recent 20th century impact involved a much smaller NEO and occurred in the wilds of Siberia, a mere four hours of planetary rotation would have placed the bull's-eye on densely populated St. Earth can't defy the odds forever, so the astronomers of the world watch the sky. Fortunately, should a significantly deadly Earth-bound asteroid present itself, we possess the technology to prevent the impact.
Scientists have proposed various mitigation techniques, ranging from the brutally simple to the overwhelmingly complex. All relevant tactics, however, center around deflection rather than destruction. Simply nuking an asteroid might merely scatter the debris -- turning a cosmic cannonball into cosmic buckshot. Worse yet, recent research indicates that an exploded asteroid would likely reform in two to 18 hours due to gravity [source: In response to a request from U.loaforsoundpicdi.cf/calling-history-warrior-of-the-night.php
From discovery to data: How astronomers track near-Earth asteroids | irapupif.tk
It is never really a good idea to blow up a potentially lethal asteroid. It can cause a fragmentation and has the ability of hitting many more places at once. Since it is hard to figure exactly how close one will pass, how do we decide which way to push it? Would be a shame to direct it into a collision course with Earth.
From discovery to data: How astronomers track near-Earth asteroids
As it is likely tumbling, Which is front or back and how can we determine the direction it will be deflected? They are talking about painting all of it in this article. White reflects the photon and little energy is transferred. Like hitting a bowling ball with a ping pong ball where most of the energy remains with the ball as it bounces off.
Black absorbs the photons so that the energy is transferred. Like throwing a velcro ball onto a fuzzy target. It stays and transfers its energy.
Tonight's Sky — Change location
For an effective solar sail, you need the highest reflectivity or albedo as possible. Reflected radiation has a higher radiation pressure against a sail, or an object than an absorbing one. Or in this case, as white as possible.
Having a black surface would reduce radiation pressure, but helps to heat an object — and emit infra-red light. This still does affect the orbit of an asteroid. Unfortunately I forgot the name of the effect. Of course it changes the course of the asteroid only marginally and slowly, thus it makes sense only in cases where an impact is well known years ahead.
Also, otherwise it might lead to a collision as well as averting it. After avoiding a collision this way, the asteroid will likely need further attention — perhaps we have to re-paint it black decades later….
Could we stop an asteroid on a collision course toward Earth?
White causes higher momentum transfer which is the decisive effect than black, since momentum of incoming and reflected light are transferred. These could eventually result in practical small-scale atomic energy sources, new propulsion systems that could make extraterrestrial mining within the solar system a possibility, and other as-yet unforeseen benefits. And finally, Incoming Asteroid! Honors in English and Philosophy, with Physics and Astronomy as supporting subjects. He holds a postgraduate Diploma in Education.
He has been President of the Association in Scotland to Research into Astronautics ASTRA three times and has also been Vice-President, Secretary, and Treasurer at various times during 47 years on the society's council; he has been on the exhibitions and publications committees since and was Assistant Curator of Airdrie Public Observatory in and again in With his wife Linda, he has launched a new organization to support newcomers to astronomy, Astronomers of the Future.
In , as Manager of the Glasgow Parks Department Astronomy Project, he designed and built the first megalithic observatory in Britain for 3, years; in he was Photo-Archivist for the Press Centre during Glasgow's year as European City of Culture; in he was Manager of the North Lanarkshire Astronomy Project, organizing nearly events including more than school visits; otherwise has been a full-time writer since About Help Blog Jobs Welcome to our new website. Benton Richard Fortey View All. Go to British Wildlife.
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About this book Contents Customer reviews Biography Related titles. About this book Incoming Asteroid! Contents - Is There a Danger? Customer Reviews Review this book.
Related Incoming Asteroid!: What Could We Do About It? (Astronomers Universe)
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