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Another Expert Agrees With Dark Comet Theory

February 21, 2013 – 11:31 am | No Comment

Astronomer David Asher (from Armagh University) has agreed with Bill Napier and Janaki Wickramasinghe (Cardiff University) that “dark comets” are real and dangerous.
The following quotes are from a paper by Napier and Asher published in Astronomy & Geophysics.
http://star.arm.ac.uk/preprints/2009/539.pdf

We know that about one bright comet (of absolute magnitude as bright as 7, comparable to Halley’s Comet) arrives in the visibility zone (perihelion q<5AU, say) each year from the Oort cloud. It seems to be securely established that ~1–2% of these are captured into Halleytype (HT) orbits. The dynamical lifetime of a body in such an orbit can be estimated, from which the expected number of HT comets is perhaps ~3000. The actual number of active HT comets is ~25. This discrepancy of at least two powers of 10 in the expected impact rate from comets as deduced from this theoretical argument on the one hand, and observations on the other, is …

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Home » Asteroids, Comets

That Unacknowledged Asteroid

Submitted by on December 3, 2010 – 12:15 pmOne Comment

Imagine if you had spotted an asteroid or comet hurtling toward Earth. Or that you became aware of such via the Interweb. It would be very useful to calculate how the collision will affect you, where you are.

In case that unlikely scenario arises, here’s some software that promises to calculate the harm you face.

Lest you be unsatisfied with a simulation of a massive rock barreling down on us, the Web site also provides data on the aftermath, including the size of the crater, the extent of the fireball, and even the height of the tsunami wave, should the object crash into the ocean.

One Comment »

  • Amy Evans says:

    Really neat web site thanks :) Now, if only we could get NASA or the ESA to provide us with information on any incoming objects to test it with (:^>)

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